Cylindrical shaped magnetic ring magnetic pass products is soft magnet oxygen body material has in electronic industry among was widely application, for soft magnet oxygen body has high of surface impedance and lower of Eddy loss, in high low frequency magnetic field in the is better than metal class material. According to different of circuit needs and work frequency are can using this class core, so regardless of in wired also is wireless communications equipment, and instrument instrument, and household appliances, are useful to the soft magnet oxygen body made of components entity.