1.Chrome steel bearing 2.low noise precision bearing 3.OEM quality standard guaranteed 4.Competitive price Good sevice, long life, high quality, high precision bearing, ISO9001:2000 ... :84822000Cage:Brass,SteelTolerance Rating:ABEC-1,ABEC-3,ABEC-5Rotational Speed:1000-4000Material:Chrome steel,Carburized bearing steel,carbon steelHardness:Chrome steel HRC60-HRC65Quality System Certificate:ISO9001 ...