miniture bearings :1,ABEC-3,5;Z2V2,Z3V3 2,High speed 3,End cover:ZZ,RS 4,Noise level:Z1, ... 5,C2,C0,C3... Lily bearing is a specialized manufacturer of miniture bearings.Features:1),Shield / closure: Open,Teflon Sealed,Rubber ... Bearings Thrust Ball Bearings Hybrid Ceramic Bearings Hybrid Ceramic Bearings High Performance miniture bearings