carbide ball bearings: 1,ABEC-3,5;Z2V2,Z3V3 2,High ... :Z1,Z2 Lily bearing is a specialized manufacturer of carbide ball bearings.Features:1),Shield / closure: Open,Teflon Sealed,Rubber ... , C3, C4, C55),Material: AISI52100, AISI440C, AISI304, AISI316, Ceramic6),Retainer: PTFE, Nylon, PEEK Or Stainless Steel7),Bore Size:from 1mm ... ),Outside Diameter:from 3mm to 300mm High Performance carbide ball bearings