... suitabletobe used in awful environment and special condition. 2) The rings and balls made of full ceramic material: ZrO2, SisN4 and Sic as ... a standardstructure, the cage made of PTFE, GFRPA66-25, PEEK, PI, AISI US304, SUS316 ... ceramic bearings4) Ceramic balls: all kinds of ceramic balls with the precision from G5 to G200,made of the material ZrO2, SiN4, SiC and ...