... Aerial industry, It can be used in extreme badly environment and special situation.About the Corrosion resistance, nonmagnetic insulated, high temperatures ... About the Ceramic bearing's cage material have PEEK, UPE, PA66, and PTFE and so on. And we can accord our customer request to ... 1.(outer, inner ring with plastic material POM,PP,PEEK,PTFE,UPE,and ball with ceramic ZrO2 ball,Si3N4 ball, glass ball ...