1,Anti rust Hydrid ceramic plasticball bearing 2,low noise and low libration 3,High accuracy ,High speed 4,OEM Service Hybrid ball bearings with ceramic balls and cages.(Inner and outer roller way is metal, rolling element is Si3N4)Hybrid bearings have advantages relative tosteel bearings1.High speedHybrid bearings can reach 3,500,000 DN in the condition of oil-mist lubrication, and can reach 1, ...