1. High quality, ISO9001:2008 2. OEM service and designed service offered 3. High quality! 1. Material: Gcr15 Chrome steel, Stainless steel or Carbon steel2. Brand: TINMY3. High quality with very smooth feeling, quality standard: ISO9001:20084. Noise level: Z1,Z2,Z3,Z4; Vibration level: V1,V2,V3,V45. Innder windage code: C0,C2,C3,C4,C56. Precision Grades: P0,P6,P5,P4,P2(ABEC1,ABEC3,ABEC5,ABEC7, ...