Paint agitator balls for model-paint bottles, 5.5 mm
Updated: October 2026
Paint agitator balls are small enough to disappear inside a Citadel pot or Vallejo dropper bottle, but their diameter, material claim and quantity still deserve checking. The three packs in this comparison all use a stated 5.5 mm size and target separated acrylic paint. Their evidence is not interchangeable: only one listing states 304 stainless steel, one has hundreds of reviews, and one contains a pack-count conflict. See the [agitator comparison](/hub/tools/agitator) for every field, or continue here to decide how many balls to use and whether a vortex shaker replaces them. A qualifying purchase can earn a commission at no extra cost to you.
Paint agitator balls are small enough to disappear inside a Citadel pot or Vallejo dropper bottle, but their diameter, material claim and quantity still deserve checking.
Paint agitator balls are small enough to disappear inside a Citadel pot or Vallejo dropper bottle, but their diameter, material claim and quantity still deserve checking. The three packs in this comparison all use a stated 5.5 mm size and target separated acrylic paint. Their evidence is not interchangeable: only one listing states 304 stainless steel, one has hundreds of reviews, and one contains a pack-count conflict. See the agitator comparison for every field, or continue here to decide how many balls to use and whether a vortex shaker replaces them. A qualifying purchase can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Steel claim | Reviews | Pack count | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  SZXMDKH SZXMDKH 120 paint agitator balls | Stainless, grade unstated | 4.7 (438) | 120 stated | 9.4 | about £5.11 | View offer |
| Best value |  n/a 120 paint agitator balls, 5.5 mm | 304 stainless stated | 4.7 (14) | 120 stated | 9.4 | about £4.71 | View offer |
 REBECCAHOWARD REBECCAHOWARD 120 paint agitator balls | Stainless, grade unstated | 4.0 (1) | Title 120, attribute 1 | 8.0 | about £4.66 | View offer |
On this page
What a 5.5 mm ball is for
A mixing ball moves through the liquid when you shake the bottle, disturbing pigment that has settled at the bottom. Reviewers of the SZXMDKH pack name Citadel, Vallejo, Army Painter and airbrush bottles. That is direct evidence for the model-paint job, although it does not prove compatibility with every cap, nozzle or formula sold under those brands. Check that the ball can pass through the bottle opening without forcing it.
All three compared packs state a diameter of 5.5 mm. The SZXMDKH and £4.71 pack titles say 120 pieces, as does the REBECCAHOWARD title. The latter also has a technical attribute saying a unit count of one. That conflict may be a catalogue error, but the available file cannot resolve it. If exact quantity matters, confirm it with the seller rather than assuming the title overrides every other field. These balls are not miniature versions of an industrial agitator. They suit closed bottles and small pots, not a decorator's bucket, a 200-litre drum or a 1,000-litre IBC. The agitator buying guide separates those tool types before price or star ratings distort the choice.
How many balls to use
The review evidence supports one or two balls as the usual starting point. Reviewers of the SZXMDKH pack describe both counts, while one person uses three balls in a 12 ml pot. That single account shows that three can work in at least one setup. It does not create a universal rule for every 12 ml container. Bottle shape, paint level and the amount of settled pigment all affect movement.
Start with one clean ball and leave enough headspace for it to travel through the paint. Close the lid tightly, shake and inspect the consistency. Add a second ball only if the first does not move the sediment effectively. Filling the bottle with balls is unlikely to help because they need space to accelerate and move through the liquid rather than sitting together at the bottom. The only review for the REBECCAHOWARD pack says the 5.5 mm balls are small enough for paint bottles and remixed separated acrylic after about a minute. Treat that as one user's result, not a guaranteed mixing time. Old or heavily compacted paint may respond differently, and no listing here proves that a ball can restore paint whose binder has failed. The how to use a paint agitator guide covers lids, cleaning and stop points.
Stainless grade and rust claims
Stainless steel does not identify one exact grade. The £4.71 pack's bullets explicitly state 304 stainless steel, while the SZXMDKH and REBECCAHOWARD attribute blocks state stainless steel without a grade. Do not merge those pages into a claim that all three packs are 304. Material details belong to the individual ASIN.
The SZXMDKH seller refers to a salt-water test, and one reviewer reports no rust after an overnight check. Another reviewer performed a magnet test. These are seller copy and household observations, not a material certificate. Likewise, the one REBECCAHOWARD reviewer says no visible rust appeared over several months in acrylic bottles, but a single experience cannot establish lifetime corrosion resistance. The narrower conclusion is that the £4.71 pack has the clearest grade statement, while the SZXMDKH pack has the largest review base. Inspect paint during storage, particularly if a bottle has been left for months, and remove any ball associated with discolouration. Do not promise that a pack will never rust. If verified composition is essential, ask for material documentation rather than relying on a product title.
Balls with a vortex shaker
A vortex shaker moves the bottle. A ball moves inside the paint. Reviews of the Magicrose shaker commonly describe using the two together, and some users say the shaker is weak without a ball. That means the £19.99 machine does not necessarily replace a £5 ball pack. It may reduce repetitive arm movement when you have many bottles, while the ball still helps break up the deposit.
The Magicrose listing claims 3,200 rpm and uses a silicone strap, but reviewers repeatedly criticise its suction feet and a power plug that works loose. Keep the bottle tightly closed and supervise the machine. One review puts the practical bottle limit at about 100 ml. That is not a manufacturer-rated capacity. Noise and early failures also appear in the review set, so the machine is not an automatic upgrade for occasional use. For a small collection, hand shaking with one or two balls may be the better-value setup. For frequent sessions across many bottles, a shaker can reduce effort if you accept the need to hold or monitor it. The best paint agitator picks compares that trade-off and explains why the review-backed SZXMDKH pack is the top pick for bottled acrylic in this set.
Small balls also require sensible storage. One compared listing gives an age line of 14 years and up. Loose 5.5 mm metal balls are small parts, so keep unused pieces and opened bottles away from young children and pets, and replace a cracked storage pot. Two SZXMDKH reviewers received a cracked pot, which is a delivery and containment problem even though it says nothing about mixing performance.
Common questions
Will 5.5 mm balls fit Citadel and Vallejo paint?
Reviewers of the SZXMDKH pack specifically report using the balls with Citadel and Vallejo paints, as well as Army Painter bottles. That supports compatibility with bottles they owned, not every container ever sold by those brands. Check the opening and do not force a ball through a narrow insert.
How many balls should I put in a 12 ml pot?
Begin with one. Reviewers commonly use one or two, while one person reports using three in a 12 ml pot. Add another only if the first does not move the sediment and there is enough space inside. The files do not establish three as a standard dose.
Does every pack use 304 stainless steel?
No. The £4.71 pack, ASIN B0F8LQ2P1Z, explicitly states 304 stainless steel in its bullets. B09Q8FCXSF and B0H86ZMGDB say stainless steel without naming the grade in the available attributes. Do not transfer the 304 claim from one ASIN to another.
Do I still need balls with a vortex mixer?
Often, yes. Reviewers of the Magicrose shaker commonly retain a ball inside the bottle, and some say the machine is weak without one. The shaker supplies rapid movement. The ball travels through the paint and helps disturb settled pigment. The combination may be more effective than either action alone.
Can I use these balls in nail polish or oil paint?
The files do not provide a supported answer for oil paint. The electric shaker listing mentions gel polish, but that does not prove that every loose ball is compatible with every polish formulation or bottle. Check the container opening and material compatibility instead of extrapolating from acrylic reviews.
Are paint mixing balls a choking hazard?
At 5.5 mm, they are loose small parts and should be kept away from young children and pets. One listing says ages 14 and up, but retail placement in a toy-related category does not make the balls a suitable toy. Store them in an intact closed container and collect spills immediately.
Why did some storage pots arrive broken?
Two reviews of the SZXMDKH pack mention a cracked pot. The available evidence does not identify whether packaging, transit or the container itself caused the damage. Inspect the delivery before opening it over carpet or near children, and transfer the balls to a secure container if the supplied pot is cracked.
Related pages
Sources
Public UK sources for DSEAR, explosive atmospheres, plugs, and work equipment. Listings are the amazon.co.uk pages stored for these ten ASINs on 15 October 2026, not a live reload on 17 October 2026. Prices on amazon.co.uk move.
- HSE, ATEX and explosive atmospheres (retrieved 15 October 2026)
- HSE OC 803/71, paint mixing (retrieved 15 October 2026)
- HSE, electricity in explosive atmospheres (retrieved 15 October 2026)
- HSE, PUWER overview (retrieved 15 October 2026)
- HSE INDG178, written schemes of examination (retrieved 15 October 2026)
- HSE MR1, mixing isocyanate two-pack paint (retrieved 15 October 2026)
- GOV.UK, Electrical Equipment (Safety) Regulations 2016 (retrieved 15 October 2026)
- Consumer Rights Act 2015, section 19 (retrieved 15 October 2026)