... C4, C5Ball bearings material: AISI52100, AISI440C, AISI304, AISI316, ceramicRetainer: PTFE, nylon, PEEK or stainless steelHardness for rings and balls: 59 ... .Versions: Ball bearings with one or two side rubber seal RS, 2RS.With one or two side metal shields ... air or by shipment: 2013 high quality ntn bearing eccentric bearing ,bearing 6205 2013 high quality ntn bearing eccentric bearing ,bearing 6205 ...