Ring Neodymium Magnet

specifications name: n45 large ring neodymium magnets for speakers with dia. 3 up to 220mm. Ts16949 & iso14001 certified. Short lead-time product name: n45 large ring neodymium magnets for audio equipments features: 1) φ3 up to 220mm 2) up to n52 max. 3) ni, zn, nicuni, gold, or epoxy coated. 4) max. Working tempeture: 250 deg. C 5) used in audio equipment, such as loudspeakers, earphones,