1. Chengdu Shuangliu Second-hand Market: Located in Shuangliu District, Chengdu, it is a large-scale comprehensive second-hand market, and its business scope includes mechanical equipment, electronic products and second-hand ball presses.

2. Sichuan Machinery and Equipment Auction Company: it is a professional organization of machinery and equipment auction in Sichuan Province, and its business scope includes auctions of second-hand machinery and equipment, second-hand ball pressing machines and mineral powder ball pressing machines.

3. Chengdu Jinjiang Second-hand Market: Located in Jinjiang District, Chengdu, it is a second-hand market with a long history, and its business scope includes mechanical equipment, electronic products and second-hand ball pressing machines.