... 3.Stable performance 4.Good corrosion resistance Ring magnets for speaker material: sintered NdFeB magnet;rare earth permanent ... mobilephone, receiver, microphone, audio equipment, motors, wind generators, sensors, leather, toys, package etcThe product we can supply including:1 ... RoHS certified. 5) Use of magnetOur magnets are used for motor speaker, hardware, package, cabinet lock ,door lock ...