Extremely versatile: kitchen, office, model making, workshop, assembly, pin board and much more. Please note: Do not put in moth or nose. These magnets have a very strong holding force, they are not a toy!. Coated with three layers of nickel, copper and nickel to reduce corrosion and provide a smooth and clean finish. Each magnet's north and south pole are on opposite curved sides. High grade N42 (NdFeB) neodymium magnet.