small steel ball bearings:1,ABEC-3,5;Z2V2,Z3V3 2,High speed 3,End cover:ZZ,RS 4,Noise level:Z1, ... ,C0,C3... Lily bearing is a specialized manufacturer of small steel ball bearings. Features:1),Shield / closure: Open,Teflon Sealed,Rubber ... : AISI52100, AISI440C, AISI304, AISI316, Ceramic6),Retainer: PTFE, Nylon, PEEK Or Stainless Steel7),Bore Size:from 1mm to 10mm8),Outside Diameter:from ...