Product Name: ring ndfeb magnet speaker part;Up to N52 max. Used in earphone, and other music equip. TS16949&ISO14001 Product Name: speaker part, n35 magnet, audio partsFeatures:1) φ3 up to 220mm2) Up to N52 max.3) Ni, Zn, NiCuNi, Gold, or Epoxy coated.4) Max. Working Tempeture: 250 deg. C5) Used in tweeters, earphone, and other musical instrument ring ndfeb magnet speaker part