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Modelling is largely an adult hobby Which is relevant to one question and not the other But the physical hazard does not consult the test So the gauges are worth knowing even outside the rules Which is a container decision Storage height does as much as the closure The magnets are the ones to lock up And loose is the operative word If you sell what you build If you only build for yourself References

The parts are not for children. The gauges do not ask who they are for.

Modelling is largely an adult hobby

Scale modelling, radio control and diorama work are done by adults with tools, solvents and patience. The products are made and marketed for them.

Which is relevant to one question and not the other

Whether a product is a children's product turns on a four-factor test, and the resin jewelry property covers it including the finding that the packaging is one of the four factors.

But the physical hazard does not consult the test

A 2 mm screw on a carpet and a neodymium magnet under a sofa are the same object whoever bought them. The cylinder is a description of a child's airway rather than of a market.

So the gauges are worth knowing even outside the rules

A modeller with a toddler in the house can use the same cylinder test to decide what gets a locking lid and what can sit open on the bench.

Which is a container decision

31 child resistant closures on this shelf. Not required by anything in this property, and the right choice for a jar of magnets in a family home.

Storage height does as much as the closure

A sealed jar on a high shelf beats a child resistant jar within reach. The container is half the control and where it lives is the other half.

The magnets are the ones to lock up

Because the injury does not announce itself. A swallowed screw is usually obvious and a swallowed pair of magnets may not be until a perforation has happened.

And loose is the operative word

The magnet standard reaches loose or separable magnets. A magnet set into a finished model is a different situation from twenty of them in an open dish on a workbench.

If you sell what you build

Then the four-factor test and the two gauges both become live, and the packaging you choose is part of the first one. That is the resin jewelry property in full.

If you only build for yourself

Nothing here is a requirement. The cylinder is still the best available description of what a small part can do, and it costs nothing to use it as one.

References

16 CFR 1501.4, test method: "Place the article, without compressing it, into the cylinder. If the article fits entirely within the cylinder, in any orientation, it fails to comply with the test procedure." Articles are then subjected to the use and abuse testing at 16 CFR 1500.51 and 1500.52, and any liberated component other than paper, fabric, yarn, fuzz, elastic and string is tested in the cylinder individually. The cylinder's dimensions are given in Figure 1 of the section rather than in its text. law.cornell.edu

16 CFR 1262.3, safety standard for magnets: "Each loose or separable magnet in a subject magnet product that fits entirely within the cylinder described in 16 CFR 1501.4 must have a flux index of less than 50 kG(2) mm(2)", tested in accordance with the method described in 16 CFR 1262.4. law.cornell.edu

The Davis Pack Supply catalog, measured 19 October 2026. The model parts and paint shelf is 1,136 rows: 646 containers and 490 closures. 5 mL to 2,000 mL with a median of 118; 25 containers at 15 mL or under, 84 at 30 or under, 183 at 60 or under, 336 at 120 or under, 522 at 250 or under. 351 PET, 117 glass, 100 HDPE, 78 PP. 376 bottles, 255 jars, 13 tubs and pails, 2 tubes. 175 clear, 141 white, 101 amber, 61 blue, 60 natural, 47 black. Closures: 288 continuous thread, 32 disc top, 31 child resistant, 26 spouted, 22 dome lids, 19 lug and twist, 14 phenolic, 13 spice caps, 11 liners and sealing discs, 10 flip top.

Written from 16 CFR 1501.4 and 16 CFR 1262, and from the catalog as it stood on 19 October 2026. No cylinder dimensions appear anywhere in this property, because the rule gives them in a figure rather than in its text. Whether a particular part or magnet passes either test is a determination about that article; we sell the container it is kept in. Whether a kit is a children's product is the four-factor test covered in the resin jewelry property.