Product name : Disc magnet,Custom Super Strong permanent 38H 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 : N48M,N35H,N38H,N38SH,N40SH,N33UH,N35EH Tolerance in size : +/-0.1 mm