Size: dia. 3 up to 220mm Up to N52 max. Max. Working Tempeture: 250 deg. C Coating: Zn, Ni, NiCuNi, Gold, or Epoxy Product Name:Ring Neodymium MagnetsMaterial : Nd2Fe14B + other rare earth materialProperties: N35,N38,N40,N42,N45,N48,N50,N52 working temperature:80 deg.N33M,N35M,N38M,N40M,N42M,N45M,N50M working temperature:100 deg.N30H,N33H,N35H,N38H,N40H,N42H,N45H,N48H working temperature:120 deg. ...