Selected raw materials used in the production of metal sheet roofing including Galvalume and Pre-painted Galvalume steel. Galvalume (GL) refers to Aluminum-Zinc alloy coated sheet steel, with good corrosion resistance and non-rusting properties, long useful life, and approved by international standards. The product is ideal for use in construction materials, specifically in roofing and building structure. For pre-painted Galvalume/Galvanized steel, the product is pre-painted by maintaining its good corrosion resistance and non-rusting properties, with extra-long useful life. It also available in multiple color choices for suitable application in various sites and conditions.