Material: this magnet is made of rare earth magnetic material, also called NdFeB magnets, or neo magnets, super powerful magnets. Neodymium Block 6"L x .4"W x .2"H Ni-Cu-Ni triple coating
This product is covered by 10 year warranty on the magnetic strength under normal usage. Used in the environment which has high temperature and virbation will void this warranty. The product should not be used in the outdoor or high humid or salty environment except extra insulation measurement is taken.