... 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 ... lubricatingEven in the condition of bad lubricating or no lubrication, hybrid bearings can ensure the bearings work regularly owe to its ...