... -standardType:More than 350 types, including metric and inch deep groove ball bearing, self-aligning bearing, angular contact bearing, plain bearing ... , and spherical bearing. Open type, seal rings, shields can be provided.Retainer: NYLON, PTFE, PEEK ... ,P 6ZrO2,Si3N41200~1208P 0ZrO2,Si3N4 SKF NSK Ceramic Deep Groove Ball Bearing6213/HC5C3