... ,Noise level:Z1,Z2 Features:1),Shield / closure: Open,Teflon Sealed,Rubber Seals,2 Metal Shield2),Tolerance codes: ABEC-1, ABEC ... , V2, V14),Internal clearance codes: C0,C2, C3, C4, C55),Material: AISI52100, AISI440C, AISI304, AISI316, Ceramic6),Retainer: PTFE, Nylon, PEEK Or ...