... 2008/SGS test report/ROHS report Stainless steel ball Name: Stainless steel ballsMaterial: AISI304,316,420C ... -150mmGrade: G10-G1000Hardness: AISI304 and AISI316 are soft materials. For AISI420C after heat-treatment, the hardness ... pumps and bearings).OUR MAIN PRODUCTS:Stainless steel ball:AISI302,304,316,420,4440CBearing steel balls: ... Information,Plz contact us! 8mm High Quality Stainless steel ball