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