... NdFeB magnet a):Shape: Ring and Disk with Ni,Zn coating. b):Grade : 35H used ... magnet,ndfeb magnetic material,magnet.a): Size Φ3----Φ280mm for Ring, and strange size.b): Grade cover N33-N52, N30M-N50M ... ..c): Coating cover Ni, Zn , Phosphated ,Gold, Silver, Epoxy etc.d): Use Nd material rather than Pr-nd material to make ...