Product name : Custom Super Strong permanent 42M Neodymium Magnets 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 : 35M,38M,40M,42M,45M,48M,50M,35H,38H,40H,42H,45H Tolerance in size : +/-0.1 mm