... ;Z2V2,Z3V3 2,High speed 3,End cover:ZZ,RS 4,Noise level:Z1,Z2 Lily bearing is a specialized manufacturer ... , ABEC-7 3),Vibration level codes: V4, V3, V2, V1 4),Internal clearance codes: C0,C2, C3, C4, C55),Material: AISI52100 ... types, Metal Shield Bearings Rubber Seals Bearings Teflon Sealed Bearingssingle row deep groove ball bearings