1.Material:Gcr15 high carbon chrome bearing steel   

2.Grade: G10,G5  
Size:3.5mm,Gauge: ±12  Subgauge:±0.4      
                        
3.the main steps to produce the ball: heading,polishing,heat treament,grinding,lapping,packing

4.the special and and fine producing-technique;the tiptop production equipment,like:super-fine dringding machine from Germany,resin super-fine grinding machine from Japan; the precision test equipment,like:automatic stee-ball shape tester,Single&Double-view metalloscope,Rockwell & Vickers hardness tester,stee-ball vibration measurer,roundness meter and etc;and an appropriate scale of operation                           

5.the product is: possible hardness, technical characteristics,perfectly shiny, compact and defect-free surface,low noise

6.HRC:62-66  Noise:26db-30db          VDWS:bellow 0.15um      VDWL: bellow 0.20um