Ring NdFeB magnets that in size of OD18*ID10*4MM used in encoder.

Disk Neodymium magnets that sized Dia9.5 * 1 mm thick,Coated by Zn.

Neodymium magnet (Nd-Fe-B) is one of the highest property and strongest permanent magnet by now, are made through powder metallurgy manufacturing techniques. They are mainly composed of neodymium(32%), iron(64%), boron(1%), and a few quantity rare earth material, such as Dy, Tb, Co, Nb, Ga, Al, Cu,etc.

NdFeB Magnets sized Dia12.5*6.5mm, coated by Zn, and Axial magnetized.