PP bearing,PEEK bearing, PTFE bearing, UPE bearing,POM bearing1.). Bearing ring: POM,PP,PEEK,PTFE,UPE 2). Ball: ceramic ZrO2 ball,Si3N4 ball, glass ball and stainless steel ball material 3). cage: PTFE,Nylonthe temperature will attainability -40~260 centi-grade Kove Bearing widely used in assembling of semiconductor, plating machinery, PCB machinery , Petrol, Chemical, Electrical, Food, Medical, Marine, Aerial industry, It can be used in extreme badly environment and special situation.