Size: 0.6mm 2) Grade: G100--G1000 3) Hardness: HRC 55--65 4) Complying with GB, ASTM ... , DIN, JIS standards 5)good surface Features:Size: 0.6mm Grades: ... G100, G200, G500, G1000 Materials: Carbon steel, Chrome steel, Stainless steel, Copper, Aluminum Complying with ... kind of high quality carbon steel ball, with special heat treatment process, is extremely superior ...