Our products have obtained ISO 9001 ---2000 International Quality System Authentication, and also our company has passed ISO14001--2004 Environmental System Management Authentication,and High-tech Enterprise of Shandong Province; our products are famous brand of Shandong especially our grinding steel ball are famous brand products in Shandong. We hold the only grinding steel ball automatic production line of roll forging machine in China which we develope and create by ourselves. the raw materials that we use are high quality alloy steel.The hardness of grinding steel ball is high and steady, and also toughness is good through controlled by equipment.The quality of our products can meet different requirement of clients in differert countries and regions. dia110-150mm HRC55-60