NdFeB magentsSize: ball,arc, sheet etcGrade:N48 (N,M,H,SH,UH,EH,AH)Coating:Ni,Au,Zn,Cu,Ag,Ge,Ni-Cu-NiNdFeB magnet has strong force and are applied into many industral fields.NdFeB magnet is popular with all walks of lifeIf you are interested in NdFeB ball magnet,please tell us the information as follows,Material:Sintered Neodymium..