... 3.Stable performance 4.Good corrosion resistance Ring magnets for speaker material: sintered NdFeB magnet;rare earth permanent magnetsshape: according ... , and multi-pole axially direction. 2) Product typeWe can supply block (huge and small), thin disc, thick cylinder, ring (include ... . 5) Use of magnetOur magnets are used for motor speaker, hardware, package, cabinet lock ,door lock and health care ...