Tsubaki Nakashima
Amatsuji Steel Ball Mfg. Co. Ltd.
Jiangsu Lixing General Steel Ball Co. Ltd.
Shandong Dong’a Steel Ball Group Co. Ltd.
Pujiang Zhongbao Steel Ball Co. Ltd.
Changzhou Sunan Weijie Steel Ball Co. Ltd.
Shenyang Steel Ball Co. Ltd.