... deep groove bearing:1,ABEC-3,5;Z2V2,Z3V3 2,High speed 3,End cover:ZZ,RS 4,Noise level:Z1,Z2 Lily bearing ... is a specialized manufacturer of metric deep groove bearing. Features:1),Shield / closure: Open,Teflon Sealed ... , Metal Shield Bearings Rubber Seals Bearings Teflon Sealed Bearingssingle row deep groove ball bearings