... steel, Stainless steel or Carbon steel 2. Brand: TINMY 3. High quality with very smooth feeling, quality standard: ISO9001:20084. Noise ... 5. Innder windage code: C0,C2,C3,C4,C5 6. Precision Grades: P0,P6,P5,P4,P2(ABEC1,ABEC3,ABEC5,ABEC7 ... certified with TS16949 and ISO9001/2000 quality control system. Axle Tapered Roller Bearing