... and specially condition. The rings and balls made by full ceramic material: Si3N4 or ZrO2, as a standard constructure,the ... make the cage with GFRPA66-25, PEEK,PI, Phonemic Textiles Tube ,etc.Features: 1, Material: ZrO2, Si3N4, SiC and Al2O3, ... bearings, 2) Ceramic Angular contact ball bearings, 3) Ceramic Thrust ball bearings, 4) Ceramic Self-aligning ball bearings, 5) Ceramic insert bearings: UC201 ...