1.Materials: Neodymium-Iron-Boron 2.N35 1/2 x 1/16" NdFeB Magnet, Nickel coating 4.Certificate:ISO9001: ... 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 ...