This is a small and strong square neodymium magnet (cube magnet) with a length of 10mm, a width of 10mm and a thickness of 10mm, N35 grade, the surface coating is nickel-copper-nickel, you don't think they are small, but they have a strong pulling force, You need to be careful when using or playing, it is mostly used in magnetic toys, electronics, industry, and similar sizes are 3x3x3mm, 4x4x4mm....