INR high precision P5 hybrid bearing has following propertites: Inner ring material: SUS 440, AISI 304, or AISI 316 Outer ring material: SUS 440C,AISI 304,or AISI 316 Ball: Ceramic ZRO2, OR SI3N4.(G5) Cage :Stainless steel, Nylon 66, PTFE,PEEK ,Brass or as per your request For the application of self-lubrication and high speed with our P5 precisions. Normal P0,P6 also available as per request.