shimano 105 sealed bearings:1,ABEC-3,5;Z2V2,Z3V3 2,High speed 3, ... is a specialized manufacturer of shimano 105 sealed bearings. Features:1),Shield / closure: Open,Teflon Sealed,Rubber Seals,2 Metal Shield 2),Tolerance ... 10mm8),Outside Diameter:from 3mm to 30mm Currently, our miniature bearings contains the following types, Metal Shield Bearings Rubber Seals Bearings Teflon Sealed Bearings