Stainless Steel Balls, Carbon Steel Balls, Ball Joint manufacturer / supplier in China, offering Si3n4 Silicon Nitride Balls for Auto Parts and Bearings - 1.588mm/2.381mm/ 2.778mm/3.175mm/3.969mm, Si3n4 Silicon Nitride Ball for Auomative Parts and Bearings 3.175/3.969/4.763/5.556/6.35mm, Stainless Steel Pins, Rollers, Needle Rollers of Short Delivery, Needle Roller Bearing and so on.