1)size:8-130mm 2)high hardness and low breakage 3)good wear-resistant 4)applied:mine;cement plant;power station;etc 1,High chrome cast ballsSize: 8mm-130mmHardness:HRC58-65; Chrome content:11-27%2,Low chrome cast ballsSize: 8mm-130mmHardness:HRC45-55; Chrome content:1-3.5% 3,photos: forged grinding ball and cast grinding ball(ISO9001:2000)