Bicycle Steel Balls Features: 1) Material: AISI 1010-1085 2) Size: 1/8", 3/16", 5/32", 1/4",5/16", 3/8" 3) Grade: G1000,G500,G200,G100 4) Hardness: HRC60,HRA78-80 5) Packing: Industry packing, poly bog, plastic box, steel box for one gross, Outer packing: export carton