The linked summary isn't clear on the rule itself and the rule documentation is 37 dense pages, but the key point: Each loose or separable magnet in a product

The linked summary isn't clear on the rule itself and the rule documentation is 37 dense pages, but the key point: Each loose or separable magnet in a product that is subject to the rule and that fits entirely within CPSC’s small parts cylinder must have a flux index of less than 50 kG^2*mm2. Deeply frustrating, even if it's justified.