... 3. more size can be custom-made round magnets with screw holes material: sintered NdFeB magnet;rare earth permanent ... speakers, headphone, mobilephone, receiver, microphone, audio equipment, motors, wind generators, sensors, leather, toys, package etcThe product we can supply including ... of magnets, and also include special magnetic-bar, magnet with iron-shell, adding water-proof pvc film magnet, and ...