... ceramic balls (Si3N4), Zirconia (ZrO2), alumina (Al2O3) and so on. Si3N4 which is superior overall performance, with low ... , anti-magnetic insulation, wear-resistant, self-lubricating and rigidity and good. Ceramic ball bearings have become the preferred material ... drill bearing, high-speed grinding bearing, instrument bearings, hard disk drive bearings. Can also be applied such as roller skates ...