1) Specifications: diameter from 1.0mm to 90mm 2) Material No. 59-1, H62, Red Copper 3) Grade: 100-1000 Brass Balls ... Copper Balls1) Specifications: diameter from 1.0mm to 90mm2) Material No. 59-1, H62, Red Copper3) Grade: 100-10004) Hardness ≤HRC205) Surface ...