Specifications 1) Materials: AISI52100,AISI440C,SUJ-2,100CrMnSi6-4 2) Size: 19.05mm-150mm 3) Grades: G20-G1000 4) Standards: ISO9001:2000 We have been produced high carbon chrome steel ball and high carbon chrome stainless steel ball for 20 years. We sincerely hope to cooperate with you!