... specially condition. The rings and balls made by full ceramic material: Si3N4 or ZrO2, as a standard constructure,the ... ,etc.Features: 1, Material: ZrO2, Si3N4, SiC and Al2O3, etc.1).High speed bearings:12000rpm--75000rpm2).High temperature-resistant ... bearings, 2) Ceramic Angular contact ball bearings, 3) Ceramic Thrust ball bearings, 4) Ceramic Self-aligning ball bearings, 5) Ceramic insert bearings: ...