Roller Bearings Marterial: Gcr15 Seal material: Rubber,Ferrum Noise: Z1,Z2,Z3 Vibration: V1,V2,V3 Roller BearingsMarterial: Gcr15Seal material: ... 6204, 6205, 6206, 6207, 6208, 6209, 6210, 62124) 63 series : 638, 6300, 6301, 6302, 6303, 6304, 6305, 6306, ... , 6905, 6906, 6907, 6908, 69097) Inch size series: R6, R8, EE3, EE48) Specifc designed bearings for motorcycle Double row Tapered roller bearings