... and specially condition. The rings and balls made by full ceramic material: Si3N4 or ZrO2, as a standard constructure,the cage made ... GFRPA66-25, PEEK,PI, Phonemic Textiles Tube ,etc.Features: 1, Material: ZrO2, Si3N4, SiC and Al2O3, etc.1).High speed bearings ... - UC220 , 6) Hybrid ceramic bearings: (rings in chrome steel or stainless steel, ball in ceramic of Si3N4 or ZrO2 material) 2012 wqk hot ...