1)motorcycle bearings 2)607-609,6000-6012,6200-6216,6300-6316 ... )OEM Manufacturer 5)ABEC-1,ABEC-3,ABEC-5. 1)Motorcycle bearing.2)607-609,6000-6012,6200-6216,6300-63163 ... (Open),Z,ZZ,RS,2RS,UG.5)Vibration and Noisy level: Z1,Z2,Z3,ZV1,ZV2.ZV3.Z1V1.Z2V2.Z3V3.6 ... )Precision level:ABEC-1,ABEC-3,ABEC-5.7)Fields Used in : Motorcycle , Motor , Pump ,Fan,Air conditioner ...