precision bearing co : 1,ABEC-3,5;Z2V2,Z3V3 2,High speed ... :ZZ,RS 4,Noise level:Z1,Z2 Lily bearing is a specialized manufacturer of precision bearing co.Features:1),Shield / closure: Open,Teflon ... Bearings Teflon Sealed Bearings Flanged Ball Bearings Thrust Ball Bearings Hybrid Ceramic Bearings Hybrid Ceramic Bearings