5PCS 20mm Dia x 10mm N52 Neodymium Strongest Grade MagnetDescription:Strong magnetic NdFeBCircular 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: DiscGrade:  N52Plating:  Ni-Cu-Ni ( Nickel )Max Temp (degrees C):  80Material:  NdFeBColor:  SilverMagnetic face diameter: 20mmThickness: 10mmQuantity: 5 pcsNote: 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