- Yieh Corp. Shanghai
- Main business:
- Caribbean RegionBermuda
- Hebei Honry Steel Pipe Co., Ltd
- Main business:
- Caribbean RegionBermuda
- Zhuhai Tianke Energy-Saving Equipment Manufacture Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- Penroc EMC LLC
- Main business:
- Caribbean RegionBermuda
- Wisdom International Trade Singapore
- Main business:
- Caribbean RegionBermuda
- NINGBO JINTIAN COPPER TUBE CO .LTD
- Main business:
- Caribbean RegionBermuda
- Tianjin Tianyingtai Group
- Main business:
- Caribbean RegionBermuda
- Hebei Xinlian Oil Pipe Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- Hebei Smart Steel Tube Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- Shandong hua steel
- Main business:
- Caribbean RegionBermuda
- Jiaxing Diyi New Energy Co., Ltd
- Main business:
- Caribbean RegionBermuda
- LIAOCHENG XINCHENG PIPE LTD
- Main business:
- Caribbean RegionBermuda
- Yanshan Yutong Steel Pipe Co., Ltd
- Main business:
- Caribbean RegionBermuda
- WENZHOU HONGYA MACHINERY INDUSTRY AND TRADING CO.,LTD
- Main business:
- Caribbean RegionBermuda
- Cixi Shuangying Pipe & Valve Co.,Ltd
- Main business:
- Caribbean RegionBermuda
- Hebei Zhonghai Steel Pipe Manufacturing Co.,Ltd
- Main business:
- Caribbean RegionBermuda
- Cliffhanger S.p.A Italy
- Main business:
- Caribbean RegionBermuda
- Yantai Hengyuan Industry and Trade Co.,Ltd
- Main business:
- Caribbean RegionBermuda
- THEJIANG GUOBANG STEEL CO.,LTD
- Main business:
- Caribbean RegionBermuda
- Hebei honry steel pipe Co.,Ltd.
- Main business:
- Caribbean RegionBermuda