... 4.meet:ISO9001:2000 , CTI Test magnetic NdFeB disk Magnet(NdFeB magnet) is made from Neodymium,Iron,Boron ... used in computers(voice coil motor of hard disc drive, pick-up of optical disk drive), mobile phones, wind generator, magnetic resonance ... image, Hi-Fi system, auto motors, etc. Certifications:ISO9001:2000SGSCTI NdFeB Magnetic disk