The hybrid ceramic ball bearing developed by Ningbo Benlun Bearing Co., Ltd. features bearing rings made of bearing steel (Gcr15). The ceramic ball is mainly made of Si3N4, ZrO2, Al2O3, etc. The density of Si3N4 ceramic is 3.20g/cm3, much lower than that of bearing steel (7.85g/cm3). For this reason, the ceramic rolling element can effectively restrain the centrifugal force generated by high-speed rotation and reduce the load of rolling element, greatly expanding the application of rolling bearings. Meanwhile, it can also reduce the rotational slide between the rolling element and the raceway surface and thus can significantly extend bearing contact fatigue life. Therefore, ceramic ball bearing can be used in high-speed rotation application, such as high-speed motor spindle bearing, machine spindle bearing, dental drill bearing, high-speed wheel head bearing, instrument bearing and hard drive bearing. It can also be used in civilian products like roller skate, aero-modeling and electric toy.