... .Cage: steel cage.copper cage.nylon Specifications1.Structure : Needle.2. High accuracy.3. Needle roller bearing.4. ISO9001:2000 Quality.5. OEM service.6. Favorable ... machine, Fitness sports equipment,Medical device,Printer,Automatictellermachine,Modelairplane etc.Precision rating: ABEC1,ABEC3,ABEC5,ABEC7,ABEC9,P0,P6,P5,P4 ...