Product name : rare earth magnet,Custom Super Strong permanent N38 Neodymium Arc Magnets for PM motor Shape:Segment, Disc, Cylinder/Rod, Ring, Countersunk, Segment, Trapezoid, Irregular shapes are available, Customized shapes for Sintered NdFeB Magnet are also available) Direction of magnetisation : Through the thickness or through the diameter Type of coating : Nickel, Ni-Cu-Ni, Zn, Gold, Silver, Copper, Epoxy, Chemical, PTFE, Parylene, Everlube, Passivation and so on. Grade : N35,N42,N50,N42M,N48M,N40H,N45H,N35SH,N45SH,N30UH,N38EH Tolerance in size : +/-0.1 mm