NdFeB Magnetic Materials Dia.3 up to 220mm Up to N52 Max. Working Temp.: 250 deg. C Coating: Zn, Ni, NiCuNi, Gold, or Epoxy Product Name: NdFeB Magnetic Materials Features: Size:φ3upto220mm UptoN52max. Max.WorkingTempeture:250deg.C Coating:Zn,Ni,NiCuNi,Gold,orEpoxy Applications: Speakers,esp.Mobilephone,earphone,multimedia,homeandprofessionalaudio.