... price with high quality used for medical machin gold-coated steel ballsMaterials: AISI E52100, 100Cr6, SUJ 2; Grade: Grade10 to ... .8mm-250mm Complying to: ISO3290 reasonable pricewe are the professional steel ball manufacture company and established more than 20 years now ... and low-noise bearing, bicycle, motorcycle, automobile, bags, electrical industry. 6.35mm G20 gold-plated stainless steel ball