... bears high temperature, the higher utilization of hot metal. name: The mould of oval ball With special alloy materials, advanced production ... for more than 4,000 times, and make grinding ball crystal more thinner, organization more compact, hardness more higher ... , appearance more aesthetic, high-gloss, no deformation. oval ball specificationsφ20x35φ60x97φ25x41φ70x113φ30x49φ80x129φ40x65φ90x146φ50x81