Household grass
Your manual allows 3.0 mm and you cut ordinary grass. A short round spool is the trial pack. The Oregon round 15 m is £7.79, model 69-368-YE, with a one-year warranty on the listing.
The best 3 mm trimmer lines, compared.
Top pick: Oregon round 3.0 mm, 56 m – Highest score in this comparison, 9.4 out of 10, from 4,714 amazon.co.uk reviews. Best value: Oregon round 3.0 mm, 56 m – 56 m of round nylon at £18.78, with a one-year warranty and a 580 g pack weight. Updated October 2026.
3 mm strimmer line is heavy-gauge nylon for a head whose manual allows 3.0 mm. Many cordless and plug-in strimmers stop at 1.6 mm or 2.0 mm, so the head decides whether this gauge will feed. If the manual stops below 3.0 mm, the nearer comparison is [trimmer line 2mm](/hub/lawn-and-garden-equipment/trimmer-line-2mm). Star line cuts on the edges and holds less material, so it can break or weld sooner. Duoline is round line with a carbon-loaded core and a flexible skin. None of them replaces a blade on wood. One cited manual holds about 6 m on a 10 cm head, so do not wind a whole spool in. The 169 m listing weighs less on the page than that 56 m spool, so its price per metre is not treated as confirmed. Oregon's UK pages call 3.0 mm a large-area landscaping size. Oregon head is capped at 3 mm on about 25–40 cc machines. If the line will not pass the eyelet, it is too thick.
3 mm strimmer line is heavy-gauge nylon for a head whose manual allows 3.0 mm. Many cordless and plug-in strimmers stop at 1.6 mm or 2.0 mm, so the head decides whether this gauge will feed.
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Question 1 of 2
What does the manual allow?
The 56 m Oregon spool balances useful capacity with a £18.78 price that is easier to justify than the largest packs. Its straightforward 3.0 mm round nylon should suit routine grass and weed cutting where the head is rated for this gauge. The listing states a one-year manufacturer warranty and a 580 g pack weight, with no conflict over the advertised diameter or length. Its 4.6 rating from 4,714 reviews looks strong, but that pool is shared with the 169 m listing and some comments name 2.0 mm line. One UK comment recommends soaking the line, though that is user experience rather than a universal fitting rule. This is our best value for regular users who want more than a 15 m trial pack without relying on the questionable 169 m specification.
Pros
Cons
Best for: Regular garden maintenance with a head explicitly rated for 3.0 mm line.
Less suitable: First-time 3.0 mm buyers who only need a small trial or users demanding variant-specific reviews.
Specifications
Common questions
How long is this Oregon round line?
The extract says 3 mm by 56 m, yellow nylon, model 69-370-Y, weight 580 g, and a one-year manufacturer warranty.
Is the 4.6 score only for 56 m?
No. The same 4.6 from 4,714 reviews and the same UK texts are on the 169 m listing. Some of those texts name 2.0 mm line.
Does a UK review mention soaking the line?
Yes. One UK text in this shared pool says to throw the line in a bucket of water and treats most breakages as pilot error.
On paper, this £31.18 Oregon spool offers 169 m of 3.0 mm round nylon for high-volume use. That length would normally appeal to contractors or owners of large plots who want fewer repeat purchases. However, the listing gives a weight of 360 g, while the 56 m spool is listed at 580 g, so the specification contains a material inconsistency that prevents a confident value-per-metre comparison. The 4.6 rating from 4,714 reviews is also the same pool used for the 56 m pack, including comments about 2.0 mm line. A one-year manufacturer warranty is stated, but it does not resolve what quantity is actually represented by the weight field. Buy only after confirming the length and pack weight with the seller; otherwise the 56 m spool is the clearer bulk step.
Pros
Cons
Best for: High-volume users who obtain confirmation of the 169 m length and pack weight before purchase.
Less suitable: Buyers who need a verified bulk quantity or a clean variant-specific review record.
Specifications
Common questions
What length does the listing claim?
The title and item length say 169 m at 3 mm, model 69-371-Y. The length-range field also says 0–169 m.
Why is the weight hard to trust?
This extract says 360 g. The 56 m Oregon round spool in the same category is listed at 580 g. The 169 m figure was not changed.
Are the reviews separate from the 56 m pack?
No. The star rating is the same 4.6 from 4,714, and the UK texts match the 56 m extract, including reviews that name 2.0 mm.
The 120 m Oregon Duoline spool gives frequent users a substantial supply of 3.0 mm round line for thick grass, weeds and abrasive boundaries. Its dual-material construction combines a carbon-loaded core with an outer skin that Oregon claims reduces welding, making it the most work-focused option in this comparison. The 1.14 kg spool costs £36.47, so it makes more sense for a large garden or regular brush-cutter use than for occasional edging. UK feedback is not uniformly positive: some buyers praise its performance around concrete edges, while others describe the line as weak or return it for a thinner gauge. The 4.5 rating comes from a pool of 952 reviews that includes comments about other sizes, so it is not a clean test of this 3.0 mm spool alone. Provided your manual explicitly permits 3.0 mm line, this is our top pick for sustained work rather than the safest choice for a small domestic strimmer.
Pros
Cons
Best for: Large gardens and regular brush-cutter work where the machine manual explicitly allows 3.0 mm line.
Less suitable: Small domestic strimmers, occasional edging and any head with a maximum below 3.0 mm.
Specifications
Common questions
What diameter and length is this Oregon spool?
The title and size field say 3.0 mm by 120 m, model 106504E. A separate listing field says a cutting width of 3 centimetres, which does not match that diameter.
What is the line made of?
The listing describes a dual-material round line with a carbon-loaded core and an anti-weld surface. The up to 30 percent more durable sentence is a listing claim.
Does the listing prove it fits every strimmer?
No. The bullet names several brands and says standard heads. That is a listing sentence. The manual still sets the maximum diameter.
Oregon's 15 m star line gives a 3.0 mm-compatible head five defined edges for cutting medium grass, long grass and weeds. It costs £9.60, so the short pack is a practical trial if you want to compare shaped line with ordinary round nylon. One UK allotment user reported that a pack lasted 18 months with fortnightly use on two plots, showing the potential when the line and head work well together. Another buyer used the same 15 m in about ten minutes, which shows how sharply results can change with the machine, vegetation and feed. The 4.4 score from 4,810 reviews is shared with other star-line gauges rather than isolated to this pack. It is a sensible shaped-line choice for a head that already feeds star cord cleanly, but not for a machine that has welded or jammed shaped line before.
Pros
Cons
Best for: Compatible heads that have previously fed shaped line cleanly, especially for weeds and longer grass.
Less suitable: Heads prone to welding, small electric strimmers or users who prioritise maximum nylon volume.
Specifications
Common questions
What shape is this Oregon line?
The listing says a star with five cutting edges, 3.0 mm, style name 15 m, model 110986E. It also claims aluminium particles in the nylon.
How long did 15 m last in the UK reviews?
One allotment review says a pack lasted 18 months of fortnightly use on two plots. Another says 15 m went in about ten minutes in a small garden. Both are in the extract.
Will it fit a small electric strimmer?
The listing says standard heads and names several brands. One UK reviewer wondered if it was too thick for a Black+Decker. The machine manual is the limit, not the bullet.
This 15 m Oregon pack is a manageable way to try 3.0 mm round nylon without storing a trade-size spool. At £7.79 and 140 g, it suits occasional refills and lets you confirm how the line feeds before committing to 56 m or more. The listing consistently identifies the product as 3.0 mm by 15 m and states a one-year manufacturer warranty. Its 4.3 rating is backed by a very large 14,157-review family pool, but the visible comments also discuss 2.4 mm and 1.65 mm variants. That makes the rating useful as broad brand-family evidence rather than a verdict on this exact pack. Choose it for low-volume use on an approved head, but expect poorer value per metre than the larger Oregon spools.
Pros
Cons
Best for: Occasional users who want to trial 3.0 mm round line in a compatible head.
Less suitable: Large plots, frequent clearing or buyers seeking reliable model-specific review evidence.
Specifications
Common questions
How much line is in this pack?
The size field says 3.0 mm by 15 m, yellow round nylon, model 69-368-YE. The extract weight is 140 g.
Is a warranty stated?
Yes. The extract says a one-year manufacturer warranty.
Are the 14,157 reviews only about this 15 m spool?
The extract's opening UK reviews also discuss 2.4 mm and 1.65 mm. Treat 4.3 from 14,157 as the variation family, not this length alone.
The Zeqeey spool supplies 50 m of 3.0 mm star nylon for £10.99, making it an inexpensive way to buy substantially more shaped line than the 15 m Oregon pack. Three UK reviewers describe it as strong and good value, and one used it on both grass and briars. That same feedback says durability fell on the briars, so the aggressive profile does not guarantee long life in woody growth. The 4.3 rating is based on 59 reviews, while only three visible comments in the extract are from UK buyers. The listing also makes a broad lawn-mower compatibility claim that should not replace the diameter limit in your head manual. It suits a compatible strimmer where you already know star line feeds cleanly, but the evidence is thinner than for the established Oregon packs.
Pros
Cons
Best for: Value-conscious users whose 3.0 mm-compatible head already works well with star line.
Less suitable: Heavy briar clearing, heads prone to welding or buyers wanting a large UK evidence base.
Specifications
Common questions
What size is this star line?
The listing says 3.0 mm, also printed as 0.12 inch, and 50 m, also printed as 164 ft. The extract weight is 310 g and the model is 3501060401.
What did UK buyers say?
Three UK texts call it good value and strong. One of them used it on grass and briars and said it was less durable on the briars. Later reviews are from outside the UK.
Does the listing say it fits a lawn mower?
Yes, the bullets say lawn mowers as well as trimmers. The product is still a 3.0 mm star cord. The head has to accept that diameter.
At £4.29 for a stated 15 m, the Navoys pack is the cheapest entry in this comparison. The problem is that the listing does not establish what you will receive: the title says 3 mm, one bullet says 1.65 mm and another highlight mentions 2.4 mm. Its 4.2 rating comes from only 39 reviews, and one visible review is unrelated to strimmer line. The relevant UK feedback is also mixed, ranging from 'did the job' to five breaks in five minutes. A low purchase price cannot compensate for uncertainty over the diameter, because the head and motor limits depend on that measurement. We would wait for the seller to correct the specification rather than treat this as a dependable budget 3.0 mm option.
Pros
Cons
Best for: Buyers prepared to confirm the actual diameter with the seller before ordering.
Less suitable: Anyone who needs a verified 3.0 mm line or wants predictable durability.
Specifications
Common questions
Is this definitely 3 mm line?
The title, style name, and size say 3 mm by 15 m. A bullet says 1.65 mm, and a highlight mentions a 2.4 mm option. The extract does not resolve that.
What did UK reviewers say?
One called it strong so far and said to check it fits. One said it did the job. One said it broke five times in five minutes. Another review is about drilling a door.
Is a warranty listed?
No warranty period is in the extract.
For this comparison we read seven amazon.co.uk spools stated as 3.0 mm and the public UK sources below. Scores follow the display rating on each listing. We did not run a laboratory test. A sentence that says universal fit is not treated as proof that the head accepts 3.0 mm.
Maximum diameter
30%The manual, head label or guard sets the ceiling. Up to 3 mm is a limit, and Oregon head 108461A is capped at 3 mm on about 25–40 cc machines.
Head and capacity
20%If 3.0 mm will not pass the eyelet, it is too thick. A 50–169 m pack is a shelf refill. One manual cites about 6 m on a 10 cm head.
Shape
20%Round nylon for grass. Star cuts on the edges and holds less material, so it can break or weld sooner. Duoline is round line with a carbon-loaded core and a flexible skin.
Length and listing honesty
15%A 15 m donut is a top-up. Conflicting diameter sentences, and a star rating shared across lengths, are one listing problem, not two products.
Shelf price
15%Prices are the amazon.co.uk figures on 16 October 2026, from about £4.29 to £36.47. Pence per metre is arithmetic on those figures, except where the pack weight disagrees with the length.
Match the diameter to the manual, then the shape to the vegetation, then the pack length to how often you refill. A low price does not fix a second diameter in the same listing.
A 3.0 mm strimmer line is heavy-gauge nylon for a head whose manual, label or guard allows that diameter. Oregon's UK pages call 3.0 mm a large-area landscaping size. Many cordless and plug-in strimmers stop at 1.6 mm or 2.0 mm. Up to 3 mm is a ceiling. Oregon head 108461A is capped at 3 mm on about 25–40 cc machines. If the line will not pass the eyelet, it is too thick.

A universal-fit bullet does not raise the head limit. If 3.0 mm will not pass the eyelet, it is too thick for that machine.
A 50–169 m pack is a shelf refill. One manual cites about 6 m on a 10 cm head. Wind with the arrow and keep the tails equal.
The 56 m and 169 m Oregon round listings share 4.6 from 4,714 reviews. Some of those texts name 2.0 mm line.
Diameter is the first cut because a line that is too thick will not feed, and a line that is forced in loads the head and the guard. Read the manual, the head label or the guard before any universal-fit sentence. Up to 3 mm means 3 mm is the ceiling. Oregon head 108461A is an example of a head capped at 3 mm, stated for about 25–40 cc machines. In this set, six listings agree on 3.0 mm in the main fields. The Navoys title says 3 mm, a bullet says 1.65 mm, and a highlight mentions 2.4 mm.
Shape is the second cut once the diameter is allowed. Round nylon, including the Oregon 15 m, 56 m and 169 m packs and the Navoys title, keeps a full cross-section and suits ordinary grass. A five-point star, Oregon 110986E at 15 m and Zeqeey at 50 m, cuts on the edges and holds less material, so it can break or weld sooner. One UK allotment text on the Oregon star says a pack lasted 18 months of fortnightly use. Another says 15 m went in about ten minutes.
Three typical situations, each with a recommendation from this comparison.
Your manual allows 3.0 mm and you cut ordinary grass. A short round spool is the trial pack. The Oregon round 15 m is £7.79, model 69-368-YE, with a one-year warranty on the listing.
A petrol machine rated for 3.0 mm, with nettles and thick grass. Star line is the shaped option, with the guard on. It is not a blade. The Oregon star 15 m is £9.60, model 110986E.
You already know the maximum diameter and the head capacity. The Oregon Duoline 120 m is the long dual-material spool at £36.47 for frequent work, not for a small domestic strimmer.
The top pick is Oregon round 3.0 mm, 56 m, with the highest score in this comparison (9.4 out of 10, from 4,714 amazon.co.uk reviews). If you want a mid-length round spool with a stated one-year warranty, the best value is the Oregon round 56 m, model 69-370-Y, at £18.78 and 580 g. The 169 m listing shares that 4.6 from 4,714 reviews and is listed at 360 g, so its price per metre is not treated as confirmed. The Navoys title says 3 mm while a bullet says 1.65 mm.

Oregon round 3.0 mm, 56 m
Highest score in this comparison, 9.4 out of 10, from 4,714 amazon.co.uk reviews.

Oregon round 3.0 mm, 56 m
56 m of round nylon at £18.78, with a one-year warranty and a 580 g pack weight.
Editorial

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.
Guides on what to look for, how to use a product, and common mistakes.
Sources checked for this comparison; last retrieved on 16 October 2026.
This page contains affiliate links to amazon.co.uk with the tag pcuk26-21. If you buy through them, we may earn a commission at no extra cost to you. Prices, stars and review counts come from the amazon.co.uk listings. We did not run a laboratory test, and we do not promise the cheapest price.