100% brand new and high quality.Precision screwdrivers for repairing .Adopt superior metal and optimized structure.1 Properties of full ceramic materialsCeramic Bearings, including components made from ceramic, have the special properties that steel bearings do not have, such as being non-magnetic or insulating. They can be used in new applications where conventional bearings have not been practical.Ceramic Bearings are highly heat resistant, enabling a rolling bearing to be practical in a high temperature environment. The low density of ceramic decreases the centrifugal force induced by rolling elements (balls or rollers), contributing to an increased speed of the apparatus.2 Structure of full ceramic BearingsFull ceramic (All-ceramic) bearing of ZrO2 materialFull ceramic bearing have excellence performance as special electrical and magnetism resistance, wear and corrosion resistance, lubrication and maintenance free when working, especially high and low- temperature application .etc. could be used in awful environment and specially condition. The rings and balls made by full ceramic material: ZrO2, as a standard construction, the cage made by PEFT.3 DementionsItem: 6811CEBore Dia (d): 55 mmOuter Dia (D): 72 mmWidth (B): 9 mmCage Material: PEFTBearing Material: ZirconiaDynamic Load Rating (Cr) (N): 6160Static Load Rating (Cor) (N): 5670Max Speed (X1000 RPM): 15Ball Qty: 22Weight (g): 58.1In order save your time. please check description before ordering.