1.Material:Gcr15 high carbon chrome bearing steel    (AISI E 52100)

2.Grade:G10    Size:2.0mm,2.381mm(3/32"),3.175mm(1/8"),3.5mm,3.969(5/32"),4.763mm(3/16"), 5.953mm(15/64"),6.35(1/4") Gauge: ±12  Subgauge:±0.4          
                    
3.the main steps to produce the ball: heading,polishing,heat treament,grinding,lapping,packing
                     
4.the product is: possible hardness, technical characteristics,perfectly shiny, compact and defect-free surface,low noise

5.HRC:62-66

6.Noise: 26-30db

7.VDWS: bellow 0.15um