DURABLE: Offers a 3-layer bright nickel + copper + low nickel finish on a steel metal base. It has excellent uniform electrodeposition performance, and has high cleaning ability, which can significantly reduce residual dust and foreign matter, and has high dimensional accuracy. It provides a shiny, rust-free and mirror-like finish.Thick steel: Thin steel refers to the saturation of magnetic flux in the magnetic circuit. Excess magnetic flux is wasted in the air and cannot be utilized.Thin paint/no spacer: thick paint will cause a lot of flux leakage, and only a small part of the flux of the magnetic hook can be used to provide attraction.Warnings and Precautions1. It is very dangerous to bring magnets close to persons holding electronic medical devices such as pacemakers. It may affect the normal operation of the equipment and cause fatal accidents.2. Normally, this magnet is too big to swallow. But you have to be careful with the placed/separated parts. If broken/detached fragments are swallowed, get medical attention right away. Keep product away from children.3. Keep magnets away from magnetic recording media such as floppy disks, digital magnetic cards, magnetic tapes, and prepaid cards. If it is placed near magnetic recording media, the recorded information may be destroyed.