... nickel,gold,silver, 3.ISO9001:2000 , CTI Test Report magnet set Magnet(NdFeB magnet) is made from Neodymium,Iron,Boron and ... Zn, Epoxy, Gold, and etc.Sizes: according to your requirementsShapes: disc, cylinder, sphere, block ,ring ,tile, arc, and etc.High magnetic ... are widely used in computers(voice coil motor of hard disc drive, pick-up of optical disk drive), mobile phones, wind ...