... -Cu-Ni, Zn, white-blue Zn, Epoxy, Gold, and etc.Sizes: according to your requirementsShapes: disc, cylinder, sphere, block ,ring ,tile, arc ... , and etc.High magnetic performance (Br: 11,000 to 14 ... are widely used in computers(voice coil motor of hard disc drive, pick-up of optical disk drive), mobile phones, ...