Roller Bearings Marterial: Gcr15 Seal material: Rubber,Ferrum Noise: Z1,Z2,Z3 Vibration: V1,V2,V3 Roller BearingsMarterial: Gcr15Seal material: ... Rubber,FerrumNoise: Z1,Z2,Z3Vibration: V1,V2,V3Clearance: C2,C3,C4Bore diameter 6~60mm<Bearing Type>1 ... size series: R6, R8, EE3, EE48) Specifc designed bearings for motorcycle Double row Tapered roller bearings