Domestic strimmer
A corded or 18 V head usually wants about 1.5–2.0 mm. Leave 2.4 mm square reels unless the manual lists that size. The Dapetz coil is 1.5 mm round by 20 m at £2.99.
Trimmer line comparison 2026
The best trimmer lines, compared.
Top pick: KINGTAIXIN Flymo spool Best value: Dapetz 1.5 mm x 20 m – Best value where the head takes 1.5 mm and 20 m is enough: £2.99, with 4.4 from 389 reviews. Updated October 2026.
Trimmer line is the polymer cord a UK strimmer spins, sold as a bulk reel, a pre-wound cassette, or pre-cut strands. You buy it because the head is empty. Check the diameter the head or the manual allows, whether the eyelets can feed the shape, and whether the listing states one size. Use 2.4 mm only where the head allows it. Strands of 37 cm by 3.5 mm belong only in a 23-37 pattern head. The and pairs share review text across two diameters, so those star counts are not two separate tests. The head wins when a grass guide and the manual disagree. When the machine itself is the question, see the [Stihl brush cutter](/hub/lawn-and-garden-equipment/stihl-brush-cutter) comparison. STIHL’s GB manual says never use wire or metal-reinforced line in a nylon head, and that over-long line makes a petrol clutch slip and overheat.
Trimmer line is the polymer cord a UK strimmer spins, sold as a bulk reel, a pre-wound cassette, or pre-cut strands. You buy it because the head is empty.
42 products checked · 64 hrs invested · +24,100 readers
12 of 12: Best trimmer lines compared
Swipe for more
1-2 of 12Best overall
Best value
3.4/10
7.9/10
7.8/10
6.2/10
6.3/10
6.6/10
6.1/10
8.5/10
9.0/10
7.6/10
4.4/10
4.6/10
∼ £3
∼ £12
∼ £11
∼ £9
∼ £13
∼ £6
∼ £6
∼ £3
∼ £6
∼ £11
∼ £4
∼ £7
5.0(1)
4.6(7,333)
4.6(7,316)
4.6(17)
4.5(146)
4.4(2,563)
4.4(2,558)
4.4(389)
4.3(14,156)
4.3(172)
4.2(39)
3.7(7)
Personal buying guide
Which trimmer line fits the head?
Question 1 of 2
What diameter does the head allow?
The best trimmer lines in detail
Our view
The KINGTAIXIN cassette is £2.99, and the bullets name Flymo FLY021 and OEM 513937190, plus Contour XT, Mini Trim and Revolution. The line diameter is not printed, and a listing question that asks for it is unanswered. There is one UK review, at 5.0, and the text is “Exactly what i needed”, with no note of fit or millimetres. The bullets say the wire is pre-wound and snaps in without tools, while the specification says assembly is required. A question about a Bosch trimmer is on the page and is not answered, so Bosch is not a stated fit. At the same £2.99 as the Dapetz coil you are told the diameter; here you are not. It is only a candidate if your Flymo already uses an FLY021 cassette and you can compare the shell you are replacing.
Pros
- £2.99 cassette claimed for Flymo FLY021 and OEM 513937190
- The bullets name Contour XT, Mini Trim and Revolution
- Pre-wound snap-in is described, so you do not wind the line
- The single UK review does not describe a defect
Cons
- Line diameter and length are not printed
- One UK review, with no detail on fit or millimetres
- Assembly required is recorded as Yes, while the bullets say no tools
- A Bosch fit is asked on the listing and not answered
Best for: A Flymo Contour XT, Mini Trim or Revolution that already takes an FLY021 cassette you can match by eye.
Less suitable: Any other brand, and a buyer who needs a stated millimetre before checkout.
Specifications
- Model
- KINGTAIXIN Flymo spool
- Brand
- KINGTAIXIN
- Price
- ∼£3
- Customer rating
- 5.0/5(1)
- Quantity
- 1 cassette
- Fit
- Flymo FLY021
- Loading
- Snap-in
- Material
- Nylon
Common questions
What line diameter does this Flymo spool use?
The listing asks the question and does not answer it. No millimetre figure is printed.
Will it fit a Bosch trimmer?
That question is on the listing and is not answered. The bullets name Flymo Contour XT, Mini Trim, and Revolution.
Is the line already wound?
The bullets say the wire is pre-wound and the cassette snaps in without tools. The specification also says assembly is required.
Our view
The Viabrico 2.0 mm listing is square nylon at £11.99, with 130 m in the bullet and 425 ft in the title, which agree within ordinary rounding. It shows 4.6 from 7,333 ratings, but long UK paragraphs also appear on the 2.4 mm Viabrico ASIN, so that star line is not a separate test of 2.0 mm. Reviewers who describe this square edge talk about clean cuts and bump-feeding on a petrol machine, and about orange offcuts that are easy to see on the lawn. One UK review calls the line very thick, hard to load, and says a cheap strimmer ran hot. A shared comment about 380 m or 390 m does not match this 130 m specification. Buy it only if the head is allowed 2.0 mm square line. The stars do not show that it lasts longer than the sister reel.
Pros
- Square 2.0 mm, about 130 m or 425 ft, at £11.99
- The bullet tells you to check that the head takes 2.0 mm
- UK comments praise cutting and orange offcuts on grass
- The title length and the bullet length agree within rounding
Cons
- Review text overlaps the 2.4 mm Viabrico listing
- One UK review reports difficult loading and a hot cheap strimmer
- A 380 m comment in the sample is not this reel
- Square line is the wrong buy if the manual names round only
Best for: A head whose manual allows 2.0 mm square line.
Less suitable: A 1.6 mm eyelet, and anyone treating the star count as a wear test against the 2.4 mm reel.
Specifications
- Model
- Viabrico 2.0 mm square
- Brand
- Viabrico
- Price
- ∼£12
- Customer rating
- 4.6/5(7,333)
- Diameter
- 2.0 mm
- Quantity
- 130 m
- Shape
- Square
- Fit
- 2.0 mm heads
- Loading
- Wind on
- Material
- Nylon
Common questions
Is this the same reel as the 2.4 mm Viabrico?
No. This listing states 2.0 mm, with 130 m in the bullet and 425 ft in the title. The other states 2.4 mm and 100 m.
Can an electric strimmer use it?
The bullet says gas and electric trimmers if the head can use 2.0 mm.
What shape is the line?
Square. The bullet says the edge is what differs from round line.
Our view
This Viabrico reel is square line stated as 2.4 mm by 100 m at £10.99, and the bullet says to check that the head can use 2.4 mm. The listing has 4.6 from 7,316 ratings. Several long UK reviews are the same text as on the 2.0 mm Viabrico ASIN, including a paragraph about 380 m that is not this title’s 100 m. Where the comments do describe 2.4 mm square line, one reviewer fitted it to a Stihl-style head on a 36 V cordless and lost less line on bed edges, and another said it passed 2.4 mm ferrules on a petrol machine. A different UK review found it extremely thick, difficult to load, and hot in a cheap strimmer. It is a long square refill for a head that already accepts 2.4 mm, not a general step up from 1.6 mm round line.
Pros
- Square 2.4 mm by 100 m at £10.99
- The bullet limits the fit to heads that can use 2.4 mm
- UK comments describe weed cutting and less line lost on bed edges
- Orange is stated, and reviewers say the offcuts are easy to see
Cons
- Some review text is shared with the 2.0 mm listing
- Hard to load, and a light strimmer can run hot, in UK reviews
- Shared comments about 380 m do not match the 100 m title
- Too thick for a head marked 1.6 mm or 2.0 mm
Best for: A petrol or electric head marked for 2.4 mm square line.
Less suitable: A small cordless head marked under 2.4 mm, and a buyer who wants an independent star sample.
Specifications
- Model
- Viabrico 2.4 mm square
- Brand
- Viabrico
- Price
- ∼£11
- Customer rating
- 4.6/5(7,316)
- Diameter
- 2.4 mm
- Quantity
- 100 m
- Shape
- Square
- Fit
- 2.4 mm heads
- Loading
- Wind on
- Material
- Nylon
Common questions
Will 2.4 mm square line fit a small strimmer?
The bullet says to check that the head can use 2.4 mm. It does not name a model.
How long is the reel?
The title and the bullet say 100 m (330 ft) and 1.7 lb. Review text about 380 m also appears on the other Viabrico ASIN and is not this specification.
Is the line round?
No. The bullet calls it a square cut.
Our view
DRERIO supplies 25 pre-cut strands, each 37 cm by 3.5 mm, at £8.99, aimed at the Bosch AFS 23-37 and the F016800431 size. The manufacturer field is DRERIO, so this is an aftermarket pack even where the bullets name that Bosch part. The bullet calls the profile a square spiral. The listing has 4.6 from 17 ratings, and only two of the review texts are from the United Kingdom. Both are positive on first use: one says they look like the original lines and cost less than the OEM pack that reviewer priced, on a machine that had come with three lines. Neither UK text states a season of wear. A listing question about how long each strand lasts is unanswered. These are inserted strands, not a reel you wind, and the £8.99 shelf price is lower than the Eyoloty pack in this set without being a wear test.
Pros
- 25 strands at 37 cm by 3.5 mm for £8.99
- The bullet names the AFS 23-37 and part F016800431
- Square spiral is stated on the listing
- Both UK texts are positive on first fit
Cons
- Only two UK reviews, and neither reports a season of use
- Aftermarket: the manufacturer is DRERIO, not Bosch
- The specification weight of 10 g is hard to reconcile with 25 strands
- Not a refill for a bump-feed spool
Best for: An AFS 23-37 head when you want more strands than the three the machine came with and you accept an aftermarket pack.
Less suitable: Any domestic bump spool, and a buyer who needs a UK wear comparison with genuine Bosch line.
Specifications
- Model
- DRERIO 3.5 mm x 25
- Brand
- DRERIO
- Price
- ∼£9
- Customer rating
- 4.6/5(17)
- Diameter
- 3.5 mm
- Quantity
- 25 x 37 cm
- Shape
- Square spiral
- Fit
- Bosch AFS 23-37
- Loading
- Insert strands
- Material
- Plastic
Common questions
Are these genuine Bosch lines?
The manufacturer field is DRERIO. The bullets say the strands match Bosch F016800431 for the AFS 23-37.
How many strands are in the pack?
The bullet says 25 strands, each 37 cm long and 3.5 mm in diameter.
Do you wind them onto a spool?
They are pre-cut strands for that brushcutter head, not a continuous reel.
Our view
Eyoloty’s pack is 24 pre-cut strands stated as 3.5 mm by 37 cm for the Bosch AFS 23-37, at £12.99. The manufacturer is Eyoloty, not Bosch, and the Bosch number F016800431 is the size the bullets claim to match. The listing shows 4.5 from 146 ratings, but only one United Kingdom review is on the page. That review says the strands fitted the AFS 23-37 and did the same job as the original on the day, then lasted about a quarter to a half as long. The same review says 3.5 mm is the widest point and the twist is narrower. The bullets also mention reloading onto a trimmer spool, which is the wrong picture for a head that takes inserted strands. A question about other Bosch models is on the listing and is not answered.
Pros
- 24 strands named for the AFS 23-37 and the F016800431 size
- The UK review reports a fit and easy fitting on that head
- Nylon is named in the bullet
- Tool-free replacement is claimed for this pre-cut pack
Cons
- The only UK review says life was about a quarter to a half of the original lines
- That review says the twist is narrower than 3.5 mm
- The manufacturer is Eyoloty, not Bosch
- A spool-reload sentence on the listing does not match an inserted-strand head
Best for: An AFS 23-37 owner comparing aftermarket strands with the Bosch pack.
Less suitable: A bump-feed spool, and any Bosch model the listing does not name.
Specifications
- Model
- Eyoloty 3.5 mm x 24
- Brand
- Eyoloty
- Price
- ∼£13
- Customer rating
- 4.5/5(146)
- Diameter
- 3.5 mm
- Quantity
- 24 x 37 cm
- Fit
- Bosch AFS 23-37
- Loading
- Insert strands
- Material
- Nylon
Common questions
Does this pack fit other Bosch models?
The listing asks that and does not answer it. The bullets name the AFS 23-37 and the F016800431 size.
Is the seller Bosch?
No. The manufacturer is Eyoloty. The Bosch part number is the size the bullets claim to match.
Is every point of the strand 3.5 mm?
The bullets say 3.5 mm. The only UK review says 3.5 mm at the widest point and less where the line twists.
Our view
The SOL twin is two 20 m lengths of 2 mm line, green, at £5.99, for a petrol or electric head that takes 2 mm. Shape is not printed as round, square or twisted. It shows 4.4 from 2,563 ratings, and the review text closely matches the 1.6 mm SOL listing, including the same reviewer names, so the two star counts are not two separate tests. Short UK lines say it does the job and that the green is easy to see. One verified review used about 15 m on an 8 m by 4 m garden edge in one session and wished they had returned it. Breakage is the repeated complaint word in that sample. Model number 700151SOL is also printed on the 1.6 mm pack. Treat it as a short 2 mm refill with an unclear profile, not as proof that 2 mm outlasts 1.6 mm.
Pros
- 2 x 20 m at a stated 2 mm, for £5.99
- Bullets cover petrol and electric heads that take 2 mm
- Short UK reviews call the price fair and the green easy to see
- Two separate lengths rather than one long reel to store
Cons
- Shape is not stated
- Review text overlaps the 1.6 mm SOL ASIN
- One UK review used about 15 m on a small lawn edge in one session
- The same model number, 700151SOL, is printed on the 1.6 mm pack
Best for: A head marked 2 mm, once you can see the profile on the coil that arrives.
Less suitable: Anyone comparing 1.6 mm with 2 mm from these star counts, and a head that needs a named square or round line.
Specifications
- Model
- SOL 2.0 mm twin pack
- Brand
- SOL
- Price
- ∼£6
- Customer rating
- 4.4/5(2,563)
- Diameter
- 2 mm
- Quantity
- 2 x 20 m
- Fit
- 2 mm heads
- Loading
- Wind on
Common questions
Is the SOL 2 mm line round or square?
The listing does not say. Shape is not in the title or the bullets.
Can it go on a petrol strimmer?
The bullets say petrol and electric. You still need a head that takes 2 mm.
Is this a different part from the SOL 1.6 mm pack?
The diameter and the colour differ. Both listings print model number 700151SOL.
Our view
The SOL 1.6 mm twin is £5.99, with 40 m in the title and a size field of 20 m by 1.6 mm, which reads as two 20 m lengths. The colour field is blue. Shape is not printed. It shows 4.4 from 2,558 ratings, and the sample overlaps the green 2 mm SOL listing, including a review that calls the line bright green. Short UK comments say it does the job and that the price is fair. Breakage language in that shared sample, including a large share of a pack used on a small edge, cannot be pinned on 1.6 mm alone. Model 700151SOL is the same string as on the 2 mm pack. It is a possible short refill for a 1.6 mm head only if the coil that arrives matches the blue specification and the head’s diameter.
Pros
- Stated 1.6 mm, with a title total of 40 m, at £5.99
- Bullets include petrol and electric heads that take 1.6 mm
- Short UK lines say the quality is acceptable and the price is fair
- Two lengths are easier to store than a 100 m reel
Cons
- Shape is not stated
- Review text overlaps the 2 mm listing, including a green-line comment on a blue specification
- The same model number, 700151SOL, is printed on both SOL packs
- Durability complaints in the overlapping text are not specific to 1.6 mm
Best for: A 1.6 mm head, once you have checked the colour and profile of the coil that arrives.
Less suitable: A star comparison of 1.6 mm against 2 mm, and a head that needs square line.
Specifications
- Model
- SOL 1.6 mm twin pack
- Brand
- SOL
- Price
- ∼£6
- Customer rating
- 4.4/5(2,558)
- Diameter
- 1.6 mm
- Quantity
- 2 x 20 m
- Fit
- 1.6 mm heads
- Loading
- Wind on
Common questions
How long is the SOL 1.6 mm pack?
The title says 40 m. The size field says 20 m x 1.6 mm, which matches a two-pack of 20 m lengths.
What colour is it?
The specification says blue. One review calls the line bright green, the same sentence as on the 2 mm listing.
Is the shape stated?
No. The listing does not say round, square, or twisted.
Our view
This Dapetz variant is 20 m of round red nylon at 1.5 mm, priced at £2.99, and you wind it onto the spool you already have. It has 4.4 from 389 ratings, and short UK reviews mostly say it does the job and is good value. One reviewer thought it lasted longer than the original line. Another found it stiff, so it sprang off the spool instead of lying flat. The title also names 1.2 mm, 1.6 mm, 2 mm, 2.4 mm and 3.0 mm, so the basket can show a different diameter from this 1.5 mm by 20 m file. The bullet’s claim about thick grass and stubborn weeds sits on a thin line. It is the best value here when the head takes 1.5 mm and 20 m is enough for the next few edges.
Pros
- £2.99 for a stated 1.5 mm round coil of 20 m
- 4.4 from 389 ratings, with no shared review pool in this set
- Wound onto an existing spool rather than a disposable cassette
- UK comments often call it enough for ordinary grass
Cons
- One UK review says the line is stiff and springs off the spool
- Only 20 m, so a season of edges may need another coil
- The title lists other diameters, so you have to confirm this variant
- The thick-weed claim is a listing sentence on 1.5 mm line
Best for: A head that takes 1.5 mm round line, when a short refill is enough.
Less suitable: Heads marked 2.0 mm or 2.4 mm, and anyone who needs 100 m in one pack.
Specifications
- Model
- Dapetz 1.5 mm x 20 m
- Brand
- Dapetz
- Price
- ∼£3
- Customer rating
- 4.4/5(389)
- Diameter
- 1.5 mm
- Quantity
- 20 m
- Shape
- Round
- Fit
- 1.5 mm heads
- Loading
- Wind on
- Material
- Nylon
Common questions
Will this 1.5 mm line fit any trimmer?
The bullet says only if you choose the diameter the head needs. This variant is 1.5 mm by 20 m.
Is it a cassette?
No. The bullet says you wind it onto your existing spool.
What shape is it?
The bullet calls it universal round strimmer line.
Our view
The Oregon 69-362-OR donut is 2.4 mm round nylon, 15 m, at £5.99, and it is the only coil in this set with a printed part number, a GTIN and a one-year manufacturer warranty. Across 14,156 amazon.co.uk ratings it sits at 4.3, and the UK sample praises the dispensing eyelet and a fit on ordinary reels. One reviewer on a Black and Decker electric found it thicker than the original line and stopped the constant snapping they had been getting. Break and snap are still the most common complaint words, including a Stihl user who said it was fine for short grass and then bought a stronger line. Fifteen metres is a small refill if the cord keeps breaking. The listing also prints Gas Powered and 2,500 RPM on a coil of nylon, which are not specifications of the line. This is the top pick when the head is marked 2.4 mm and takes round line, and a poor match for a 1.5 mm or 1.6 mm domestic eyelet.
Pros
- Round 2.4 mm by 15 m, part 69-362-OR, with a printed GTIN
- 4.3 from 14,156 ratings, the largest independent count in this set
- UK reviews mention the donut eyelet and a fit on ordinary reels
- A one-year manufacturer warranty is printed
Cons
- UK reviews report snapping on anything beyond short grass
- 15 m runs out quickly if the line is breaking
- The listing prints Gas Powered and 2,500 RPM on a coil of nylon
- The brand list is not a model-by-model fit
Best for: A head marked 2.4 mm that takes round line, used on lawn edges and short grass.
Less suitable: A 1.5 mm or 1.6 mm domestic head, and a Bosch AFS 23-37 that takes pre-cut strands.
Specifications
- Model
- Oregon 2.4 mm x 15 m round
- Brand
- Oregon
- Price
- ∼£6
- Customer rating
- 4.3/5(14,156)
- Diameter
- 2.4 mm
- Quantity
- 15 m
- Shape
- Round
- Fit
- 2.4 mm heads
- Loading
- Wind on
- Material
- Nylon
Common questions
Does this Oregon line fit most strimmers?
The bullet names Husqvarna, Stihl, Shindaiwa, Echo, Bosch, Mac Allister, and more. It is still 2.4 mm line, so the head has to take that diameter.
What shape and length is it?
Round, 2.4 mm by 15 m, orange, part 69-362-OR.
Is the line itself gas powered?
No. The product is a coil of nylon. The listing prints Power Source: Gas Powered and Speed: 2500 RPM.
Our view
Zeqeey sells 100 m of round orange nylon on a holder for £10.99, and you wind it onto the machine spool. The title says 1.6 mm and the bullet says 1.65 mm, with a tolerance of no less than 1.6 mm, so the printed size is not a single figure. It has 4.3 from 172 ratings. UK comments often praise the length and the holder that lets you pull off a piece without the coil running away. More than one UK review says it snaps on nettles, and one verified review found the diameter larger than advertised and had to shave it to start it in the spool hole. The bullet also tells you to soak the line for 24 hours, which is this listing’s instruction, not a rule for every brand. It is a long round refill only after you accept that 1.6 mm and 1.65 mm are both on the page.
Pros
- 100 m of round nylon at £10.99
- 4.3 from 172 ratings, separate from the SOL and Viabrico pools
- UK reviews praise the holder and the length for the price
- Reviewers report a fit on ordinary strimmers when the size matches
Cons
- The title says 1.6 mm and a bullet says 1.65 mm
- UK reviews report snapping on nettles
- One verified review says the line was thicker than advertised
- The bullets aim it at light grass, despite a strength claim
Best for: A head that accepts about 1.6 mm round line, when you want a long refill and can live with two printed sizes.
Less suitable: A 2.4 mm head, and anyone who needs one millimetre figure before they order.
Specifications
- Model
- Zeqeey 1.6 mm x 100 m
- Brand
- Zeqeey
- Price
- ∼£11
- Customer rating
- 4.3/5(172)
- Diameter
- 1.6 mm
- Quantity
- 100 m
- Shape
- Round
- Fit
- 1.6 mm heads
- Loading
- Wind on
- Material
- Nylon
Common questions
Is this 1.6 mm or 1.65 mm?
The title says 1.6 mm and 0.065 inch. The bullet says 1.65 mm, with a tolerance of no less than 1.6 mm.
Will it fit every grass trimmer?
The listing asks that and the bullet answers only if the machine accepts this wire size.
Does the maker suggest soaking it?
Yes. The bullet says soak the line in water for 24 hours before use.
Our view
Navoys is a 15 m coil at £3.75. The title says 2.4 mm and one bullet says this 1.65 mm strimmer line, so the page does not tell you which diameter will arrive. Shape is not printed. It has 4.2 from 39 ratings, and five UK reviews are on the listing. One says it is strong so far if you check the fit, and another says it did the job and was easy. A third says it broke five times in five minutes and was thrown away. A further UK review is about drilling holes in a door and a depth indicator, and it does not describe strimmer line. No strimmer model is named. At £3.75 it looks cheaper than the Oregon 15 m donut, and it is not a substitute for that part, because you cannot tell the size from the listing alone.
Pros
- £3.75 for a coil the title describes as 15 m
- One UK review says it did the job and was easy to use
- The bullets mention electric and petrol strimmers if the size matches
- A short length if the coil you unpack really is the diameter on your head
Cons
- The title says 2.4 mm and a bullet says 1.65 mm
- One UK review says it broke five times in five minutes
- One UK review is about a door, not strimmer line
- Shape and colour are not stated
Best for: A short refill only after you have measured the coil that arrived and it matches the head.
Less suitable: Anyone who needs the listing to state one diameter, and a stand-in for Oregon part 69-362-OR.
Specifications
- Model
- Navoys 2.4 mm x 15 m
- Brand
- Navoys
- Price
- ∼£4
- Customer rating
- 4.2/5(39)
- Diameter
- 2.4 or 1.65 mm
- Quantity
- 15 m
- Fit
- Unnamed
- Loading
- Wind on
Common questions
Is the Navoys line 2.4 mm or 1.65 mm?
The title says 2.4 mm by 15 metres. One bullet says 1.65 mm. Both are printed.
Which strimmer is it for?
The bullets say electric and petrol strimmers and brushcutters. No model is named.
Is it weatherproof?
The listing asks that and does not answer it.
Our view
Yeaskyart sells four pre-wound 1.6 mm cassettes at £6.59, and the title names AC14RL3A and Ryobi 18 V, 24 V and 40 V. The bullets then say the spools suit all grass-trimmer designs, which is wider than the title, and a question about other brands is unanswered. The title prints 11 inches long while the bullet says 11 ft per spool, so the length on each cassette is not settled. Six UK reviews sit under 3.7 from 7 ratings. One reports a fit on a Ryobi as close as the original, and cutting on thick grass without a snap on first contact. Another snaps as soon as it hits a bramble, where that reviewer said Ryobi’s own cord did not. A third objects to throwing the cassette away when the shell is still sound, and one text talks about six pieces while the title says four. These are snap-in spools, not line you wind yourself.
Pros
- Four pre-wound 1.6 mm cassettes at £6.59
- The title names AC14RL3A and Ryobi 18 V, 24 V and 40 V
- One UK review reports a fit as close as the original cassette
- The bullets claim a snap-in fit with no winding
Cons
- 3.7 from 7 ratings, the lowest star line in this set
- 11 inches in the title and 11 ft in the bullet
- One UK review says the line snaps on a bramble
- All trimmers in the bullets is wider than the models named in the title
Best for: A named Ryobi or AC14RL3A head that takes this cassette, after you have compared it with the spool in the machine.
Less suitable: Other brands, and anyone who wants to refill a cassette shell they already own.
Specifications
- Model
- Yeaskyart 1.6 mm 4-pack
- Brand
- Yeaskyart
- Price
- ∼£7
- Customer rating
- 3.7/5(7)
- Diameter
- 1.6 mm
- Quantity
- 4 spools
- Fit
- Ryobi, AC14RL3A
- Loading
- Snap-in
- Material
- Nylon
Common questions
How much line is on each Yeaskyart spool?
The bullet says 11 ft per spool. The title also prints 11 inches long. Those two lengths are not the same.
Does it fit every strimmer?
The bullets say it works with all grass-trimmer designs. The title only names AC14RL3A and Ryobi 18 V, 24 V, and 40 V. A listing question about other brands is unanswered.
Do you wind it yourself?
The bullets say the spools are pre-wound and snap in. Assembly required is recorded as No.
How we compared
For this comparison we read 12 amazon.co.uk trimmer-line listings and the public UK sources below. Scores follow the star rating and the rating count, what the listing states about size and fit, the metres against the shelf price, and UK review themes. We did not run a laboratory wear test. A star line is not a durability ranking.
1
Evidence
43%The amazon.co.uk star rating, plus a share of the rating count. Shared review text with a sister ASIN is capped. Fewer than 20 ratings is capped. Fewer than 5 ratings is capped further.
2
Listing
24%Diameter, length, shape, and a fit that is either named or honestly conditional. Points come off when two sizes, two lengths, or two colours are printed, or when a power-source field describes a coil of nylon.
3
Value
19%Stated metres against the amazon.co.uk shelf price, and only when the diameter is a single figure. A cheap coil with two millimetre figures scores low.
4
Sentiment
14%UK review themes on the listing: fit and ordinary grass against snapping, loading trouble, and off-topic text.
Independent review
Last updated: October 2026
9 sources checked
Trimmer line buying guide
Match the diameter and the shape to the head, then check that the listing states one size. Length and price come after that. A cassette only helps if the shell matches the machine.
What is trimmer line?
Trimmer line in this comparison is the polymer cord a UK strimmer spins. It is sold as a bulk reel you wind onto the spool, a pre-wound cassette, or pre-cut strands. You buy it because the head is empty. Wire and metal-reinforced line are not substitutes. STIHL’s GB manual says never use wire or metal-reinforced line in a nylon head, and that over-long line makes a petrol clutch slip and overheat. HSE’s bulletin says remove chain flails.
Best for
- A refill that matches the diameter printed on the head
- A short 1.5 mm coil or a 2.4 mm round donut when the head allows it
Not ideal for
- Wire, chain flails, or metal-reinforced line in a nylon head
- A 3.5 mm strand pack wound into a domestic bump spool
Mistakes to avoid
- 1
Choosing diameter from the grass
A thicker lawn does not raise the millimetre the eyelet can feed. Yourspares’ bands are a rule of thumb. The head or the manual wins when they disagree.
- 2
Trusting universal
“18 V” or “universal” is not a cassette. KINGTAIXIN names Flymo FLY021 and prints no diameter. Yeaskyart’s bullets say all trimmers, while the title names AC14RL3A and Ryobi.
- 3
Reading shared stars as two tests
The SOL pair and the Viabrico pair share review text across two diameters. Those counts are not two wear tests. Oregon, Dapetz and Zeqeey do not share a pool with another row here.
What to weigh up
Diameter and format
HighDiameter is the first check, and it comes from the head or the manual. Yourspares’ UK guide, as a rule of thumb, puts light grass at about 1.2–1.6 mm, general home use at 1.6–2.0 mm, thick grass at 2.0–2.4 mm, and heavy brushcutting at 2.4–3.0 mm and above. If the grass guide and the head disagree, the head wins. A 2.4 mm reel in a 1.6 mm eyelet is the wrong buy even when the stars are high.
One size on the listing
HighRead the title and the bullets as one page. Navoys titles 2.4 mm by 15 m and a bullet says 1.65 mm, so you cannot tell which diameter will arrive. Zeqeey titles 1.6 mm and a bullet says 1.65 mm, with a tolerance of no less than 1.6 mm. Yeaskyart titles 11 inches long and a bullet says 11 ft per spool. Dapetz states 1.5 mm by 20 m in this file, while the title also names other diameters, so the basket can show a different variant. Shape is the same kind of check.
Which option suits you?
Three typical situations, each with a recommendation from this comparison.
Head marked 2.4 mm
A petrol head marked 2.4 mm can take the Oregon round donut or, if the manual allows square, the Viabrico 2.4 mm reel. The Oregon part is 69-362-OR, 15 m, at £5.99.
Bosch AFS 23-37
That pattern head takes 37 cm by 3.5 mm strands, not a 100 m reel. DRERIO is 25 aftermarket strands at £8.99. The manufacturer field is DRERIO, not Bosch.
Common questions about trimmer lines
Which trimmer line is the top pick?
The top pick is the Oregon 69-362-OR, 2.4 mm round nylon by 15 m, at £5.99. It is the only coil here with a printed part number, a GTIN and a one-year manufacturer warranty, and it has 4.3 from 14,156 reviews. Use it where the head is marked 2.4 mm and takes round line. UK reviews still report snapping beyond short grass. It is a poor match for a 1.5 mm or 1.6 mm domestic eyelet, and it is not a strand pack for a Bosch AFS 23-37.
How much does trimmer line cost on amazon.co.uk?
On these listings the shelf prices run from £2.99 to £12.99. Entry, about £2.99–£3.75, is the Dapetz 20 m coil, the Flymo-pattern cassette, and the Navoys coil. Mid, about £5.99–£8.99, covers both SOL twins, the Oregon 15 m donut, the Yeaskyart four-pack, and DRERIO’s 25 strands. The upper end of this set, about £10.99–£12.99, is Zeqeey’s 100 m, both Viabrico reels, and Eyoloty’s 24 strands. Bosch’s own UK card of the same 37 cm by 3.5 mm size is £28.04 on the maker’s site, and it is not a row here.
What diameter of trimmer line should you buy?
Read the head or the manual first. Yourspares’ UK guide, as a rule of thumb, puts light grass at about 1.2–1.6 mm, general home use at 1.6–2.0 mm, thick grass at 2.0–2.4 mm, and heavy brushcutting at 2.4–3.0 mm and above. The head wins when they disagree. STIHL UK’s AutoCut 2-2 takes 1.6 mm and 2.0 mm. The AutoCut 27-2 takes 2.4 mm and 2.7 mm. Strands of 37 cm by 3.5 mm are only for a Bosch AFS 23-37 pattern head. They do not wind into a domestic bump spool.
Should trimmer line be round or square?
Round is the usual residential profile. Square has edges for thicker grass, and only if the manual allows that shape. In this set Oregon and Dapetz print round, and both Viabrico reels print square. Zeqeey prints round. SOL prints no shape on either pack, and Navoys and the KINGTAIXIN cassette print no shape either. Square line is the wrong buy if the manual names round only. A quieter-square claim is not a UK noise mark. The mark sits on the machine.
Can you use wire instead of nylon trimmer line?
No. STIHL’s GB manual says never use wire or metal-reinforced line in a nylon head, and that over-long line makes a petrol clutch slip and overheat. HSE’s bulletin says remove chain flails. ISO 11806-1:2022 covers petrol hand-held brushcutters and grass trimmers and excludes multi-piece metal attachments such as chains and flails. HSE INDG480 says the wrong wire length unbalances the head and raises vibration. Call a repairer if the guard or head is broken, or if a petrol clutch slips at idle on the correct line.
Does the trimmer line carry a UK noise mark?
No. Grass trimmers are noise-marking-only under the 2001 outdoor-noise regulations, and the mark is on the machine, not the coil. Square line is not quieter in a way that meets that law. The UK lawn mower noise rules page is about the mark on the machine. A line listing that prints a power source or an RPM figure is still a coil of nylon.
Are the 3.5 mm strands genuine Bosch line?
No. DRERIO and Eyoloty name the Bosch AFS 23-37 and the F016800431 size, and the manufacturer fields are DRERIO and Eyoloty. An aftermarket pack is not genuine Bosch because it prints that part number. DRERIO is 25 strands at £8.99. Eyoloty is 24 strands at £12.99. The only UK review on the Eyoloty listing says life was about a quarter to a half of the original lines, and that the twist is narrower than 3.5 mm. Bosch’s own UK card of that size is £28.04 on the maker’s site.
Why do two listings share the same reviews?
The SOL 1.6 mm and SOL 2 mm packs share review text, and both print model number 700151SOL. The Viabrico 2.0 mm and 2.4 mm reels also share long UK paragraphs, including comments about a length that matches neither title. Those star counts are not two separate tests. Zeqeey, Dapetz and Oregon have samples that do not overlap another row in this set. Read a shared star line as one pool, then check the diameter on the coil that arrives.
Our verdict
For a head marked 2.4 mm that takes round line, the top pick is the Oregon 69-362-OR: 15 m, a printed part number and GTIN, and 4.3 from 14,156 reviews at £5.99. UK reviews still report snapping beyond short grass, and 15 m is a short refill. If the head takes 1.5 mm and 20 m is enough, the best value is the Dapetz round coil at £2.99, with 4.4 from 389 reviews. A 37 cm by 3.5 mm strand pack is only for a Bosch AFS 23-37 pattern head.
Best value
View offer
Dapetz 1.5 mm x 20 m
Best value where the head takes 1.5 mm and 20 m is enough: £2.99, with 4.4 from 389 reviews.
Editorial
DIY & tools editor
DIY & toolsamazon.co.uk listingsLawn and garden equipment
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Updated: October 2026
9 sources checked
Guides to trimmer lines
Guides on what to look for, how to use a product, and common mistakes.
Trimmer line buying guideThe order of checks before the twelve-row table.Best trimmer lineOne top pick and one best value, and who should skip each.How to wind trimmer lineArrow, fill, soak and length, and when the line will not enter the eyelet.Round or square trimmer lineOnly the listings that print round or square.Which trimmer line diameterMillimetres against the head, with the 3.5 mm Bosch case as the exception.
Related comparisons
Sources
Sources checked for this comparison; last retrieved on 17 October 2026.
- HSE, chain-flail bulletin for brush cutters (retrieved 17 October 2026)
- HSE INDG480, hand-arm vibration (retrieved 17 October 2026)
- GOV.UK, outdoor noise regulations 2001 (retrieved 17 October 2026)
- ISO 11806-1:2022, brushcutters and grass trimmers (retrieved 17 October 2026)
- STIHL GB safety manual for FS machines (retrieved 17 October 2026)
- STIHL UK, AutoCut 2-2 mowing head (retrieved 17 October 2026)
- Yourspares, how to choose strimmer line (retrieved 17 October 2026)
- Consumer Rights Act 2015, section 22 (retrieved 17 October 2026)
- Bosch DIY, extra-strong line 37 cm x 3.5 mm (retrieved 17 October 2026)
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