... shape 3.Stable performance 4.Good corrosion resistance Ring magnets for speaker material: sintered NdFeB magnet;rare earth permanent magnetsshape: according ... N48, N35M-N45M, N35H-N45H, N35SH-45SH, and N28EH-N33EH for NdFeB (Neodymium magnet), and Y25, Y30, Y30BH, and Y35 ... are RoHS certified. 5) Use of magnetOur magnets are used for motor speaker, hardware, package, cabinet lock ,door lock and health ...