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ZK International Group Co Ltd is engaged in the manufacture and marketing of metal pipes. The company is specialized in producing double-press thin-walled stainless steel tubes and fittings, carbon steel tubes and fittings, single-press tubes and fittings, and stainless-steel strips. The products are used in restaurants, hotels, hospitals, firefighting, food, beverage, ships, engines, industrial seawater desalination and systems of direct-drinking water, cold /hot water supply, city water supply, and gas of large/middle scale construction projects.

Linde is the largest industrial gas supplier in the world, with operations in over 100 countries. The firm's main products are atmospheric gases (including oxygen, nitrogen, and argon) and process gases (including hydrogen, carbon dioxide, and helium), as well as equipment used in industrial gas production. Linde serves a wide variety of end markets, including chemicals, manufacturing, healthcare, and steelmaking. Linde generated approximately $34 billion in revenue in 2025.