... , ISO9001:2008 2. OEM service and designed service offered 3. High quality! Ball Bearing:1. Material: Gcr15 Chrome steel, Stainless steel or ... ,V3,V45. Innder windage code: C0,C2,C3,C4,C56. Precision Grades: P0,P6,P5,P4,P2(ABEC1,ABEC3,ABEC5,ABEC7 ... can further discussDelivery: around 30 days after confirm the order High Deep Groove Ball Bearings