1.material:Aisi1010-1015 1045 1085 2.hardness:60-65HRC 3.size:1/4" 4.Grade:G500/G1000 ISO qulified company Production name1/4 inch steel ball for bicycle spare partssize1/4",3/16",5/32",1/8",7/32",5/16",7/8",1"GradeG100,G200,G500,G1000,G2000HRC58-62hrcQuality certificateISO 9001:2008/SGS test report/ROHS reportPacking1, 25kg/carton with steel pallet packing2,25kg/carton without steel pallet ...