Brassco Tube Industries offers premium Copper Square Tubes—crafted from high-grade copper for exceptional strength, thermal conductivity, corrosion resistance and versatility. Ideal for applications in architecture, electrical grounding, HVAC, automotive & structural uses. Available in OD of 4 mm–150 mm, wall thickness 0.25–8 mm, length 1–6 m to exact customer specification https://www.brasscotubes.com/products/copper-square-tubes/