Taper Roller Bearins 1. High quality, ISO9001:2008 2. OEM service and designed service offered 3. Material: ... . Material: Gcr15 Chrome steel, Stainless steel or Carbon steel 2. Brand: TINMY 3. High quality with very smooth feeling, ... Z1,Z2,Z3,Z4; Vibration level: V1,V2,V3,V4 5. Innder windage code: C0,C2,C3,C4,C5 6. ... and ISO9001/2000 quality control system. Stainless Steel Deep Groove Ball Bearings