ceramic bearings 1.High Performance,Long life 2,Competitive price 3,Quick delivery,good service 4,ceramic bearing ceramic ball bearings Features: 1) Out and inner ring: zirconia2) Ball: zirconia3) Retainer: PTFE, nylon, PEEK or stainless steelFull ceramic bearing is non-magnetic, non-conductive, wear and corrosion resistant.It runs smoothly without oil or grease, which means nearly no maintenance ...