... stainless steel balls 1)100% original 2)High hardness 3)good wear resistance and no breakage 4)No spots Quick ... stainless steel ballMaterial: AISI304,316,316L,420,440,200,202MDiameter: 3.969mmGrade: G10-G1000Certificate: ISO9001:2008 SGS Packaging & Delivery Packaging ... for 20 years, epochal technology; in the future, Feige is running and reaching to a top level manufacturer of steel ball with ...