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