High manganese Forged Grinding Media Diameter: 20mm-150mm Hardness: HRC55-65(Surface and Volumetric) Characteristics: High hardness, good wear resistance, no breakage. We use the special steel materials to produce the mill balls to ensure the good performance of high hardness, high impact and wear resistance applicable in SAG mills and ball mills. For any interest or new enquiry, please don't hesitate to contact us. Thanks for your reading.