1.High Performance,Long life 2,Competitive price 3,Quick delivery,good service 4,precision precision miniature bearings Applicati on:Remote-controlled cars,bicycles ... ,Shield / closure: Open,Teflon Sealed,Rubber Seals,2 Metal Shield4,Tolerance codes: ABEC-1, ABEC-3, ABEC-5,ABEC-7 5 ... Bore sizes 0.0781 to 0.375 inches R series High Performance Precision Miniture bearing