... 3.Stable performance 4.Good corrosion resistance Ring magnets for speaker material: sintered NdFeB magnet;rare earth permanent ... headphone, mobilephone, receiver, microphone, audio equipment, motors, wind generators, sensors, leather, toys, package etcThe product we can supply including ... RoHS certified. 5) Use of magnetOur magnets are used for motor speaker, hardware, package, cabinet lock ,door lock ...