- Mitsui Mining & Smelting Co. Ltd
- The Furukawa Electric Co. Ltd
- Chang Chun Petrochemical Co. Ltd
- JX Nippon Mining & Metals Corporation
- Fukuda Metal Foil & Powder Co. Ltd
- Targray Technology International Inc.
- Olin Brass (Global Brass and Copper Holdings Inc.)
- Sumitomo Metal Mining Co. Ltd
- SH Copper Products Co. Ltd
- Doosan Corporation
- Civen Metal Material(Shanghai) Co. Ltd
- UACJ Foil Corporation