Ceramic materials (Zro2, Si3N4) has the characteristics of higher temperature resistance, corrosion resistance, wear resistance，non-magnetic，non-electrical conducting，self- lubricating，lower friction than other metal bearing materials. With a good choice of cage materials for example PTFE, Nylon 66, Polyetherimide Ammonia, Zirconia, Stainless Steel or Special Aviation Aluminum, ceramic bearing can be a perfect solution to demanding application for longer bearing life, higher speed or operating temperature up to 250 ℃.