Sets of circle and roll body of zirconia all-ceramic bearing adopt zirconia ceramic material (ZrO2), the keeper usesd the politef (PTEE) as the standard configuration, it can also generally used nylon 66 (GRPA66-25) that the glass fibre strengthened, special engineering plastics (PEEK, PI), the stainless steel (ALSI SUS316, SUS304), brass (CU),etc..