1,steel ball Material: AISI1010-1015 2,Size:1/8",1/4",3/16",5/16",5/32",3/8" 3,Grade:G1000 4,Hrc:60 5,ISO9001:2000 steel ball Material: AISI1010-1015Size:1/8",1/4",3/16",5/16",5/32",3/8"Grade:G1000Hardness: HRC60 Packing: inner packing: plastic bag/box for one gross outer packing:carton