5PCS 20mm Dia x 10mm N52 Neodymium Strongest Grade Magnet Description: Strong magnetic NdFeB Circular Disc Magnets are made from Neo Neodymium Magnet material and have strong magnetic performances. Super strong Rare-Earth magnets - once they get stuck with each other, they are hard to break apart. You should be careful to break apart not use strong power to pry open or it would cause damage and cracks in the magnetic material. Features: Shape: Disc Grade: N52 Plating: Ni-Cu-Ni ( Nickel ) Max Temp (degrees C): 80 Material: NdFeB Color: Silver Magnetic face diameter: 20mm Thickness: 10mm Quantity: 5 pcs Note: Be careful fragile and clip hand, placed in a dry place, stored at room temperature! WARNING: This is a seriously powerful magnet and it is totally unsuitable for children!!! Package Included: 5 x Strong magnetic NdFeB