... level:Z1,Z2. 5,C2,C0,C3. high Performance ceramic ball bearing-china bearingWe have 2 types of ceramic bearing, hybrid ... zirconia or zirconium oxide, they are white colored, a ZrO2 ball looks exactly like a pearl. the ceramic material is not ... lower heat generated.full ceramic Si3N4 ZrO2 Full Complement Thrusthybrid bearings high Performance ceramic ball bearings-china bearing