... 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 ... ceramic bearings: (rings in chrome steel or stainless steel, ball in ceramic of Si3N4 or ZrO2 material) 2012 wqk hot sale of ceramic ...