1,ABEC-3,5,7;Z2V2,Z3V3 2,High speed 3,End cover:ZZ,RS 4,Noise level:Z1,Z2 Z3 5,C2,C0 ... ,C3... Features:1),Shield / closure: Open,Teflon Sealed,Rubber Seals,2 Metal Shield2),Tolerance codes ... : ABEC-1, ABEC-3, ABEC-5, ABEC-73),Vibration level codes: V4 ...