Product description Quick detail Place of origin: china Brand name: guoyang Material: steel Surface hardness: over 58 hrc Product feature Characteristics: high hardness, good wear resistance, no breakage, no deformation, good quality, reasonable price Product specification/models Diameter:10, 12.7, 15, 20, 25, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 125, 130(mm) Chemical composition: Popuar grade Item:zqcr10 C(1.8-3.2), si(0.3-1.2), mn(0.2-1.0), cr(10-13), p(less than 0.1), s(less than 0.08) High chromium cast grinding balls Other information Packaging & delivery Packaging detail: by metal drums and two drums on one pallet (you can also choose the package of "bulk bags" and the charge is for free.) Delivery detail: flexible, negotiable Payment By metal drums and two drums on one pallet