ceramic ball bearings Features:1,ABEC7 2,High speed 3,End cover:ZZ,RS 4,Noise level:Z1, ... specialized manufacturer of ceramic ball bearings. We have 2 types of ceramic bearing, hybrid ceramic bearing and full ceramic bearing, the hybrid ceramic bearing has steel ... oxide, they are white colored, a ZrO2 ball looks exactly like a pearl. the ceramic material is not stronger than steel, but ...