... mix ceramic ball bearing has low density, high hardness, low coefficient of friction, there is no magnetic electricity,wear-resisting.And ... rigid self-lubricating characteristics are good, especially suitable for high-speed, high precision and long life of the hybrid ceramic ... ) or stainless steel (ALSI 440C, 316,304), the ceramic ball can select ZrO2, Si3N4 or SiC material for using ...