Plantekno&reg; 1pc (1.57"x1/5") N35 Super Strong Big Rare Earth Neodymium Magnet Premium Quality Round Disc Very Powerful NdFeB High Quality and Strong Rare Earth Neodymium Magnet N35 Grade More Powerful - Great performance Produced under ISO 9001 standard RoHS passed Neodymium Iron Boron (NdFeB) + Nickel Plated (excellent protection)