... . Ceramic Self-aligning ball bearings: 135, 126, 127, 108, 129, 1200 - 1217, 2200 - 2217, 1300 - 1314, 2300 - 2314 , 5. Ceramic insert bearings: UC201 - UC220 6. Hybrid ceramic bearings ... : (rings in chrome steel or stainless steel, ball in ceramic of Si3N4 or ZrO2 ...