Rear-earth Magnets N35 grade Disc shape,spec.10x3, Ni coating with Laser Mark Surface Treatment practicable: ZN,Ni,Tin,Gold,Epoxy,Parylene,Plastic packed, Telphlone Dimension RangeDia(1-180)mm Thickness(0.5-40)mm Grade Available:full grade Laser MarkRare earth disc magnet for sensor