... surface is coated with natural granules.Galvalume steel consists of Aluminum (55%), Zinc (43.4%), and Silicone (1.6% ), so ... it has both Aluminum-unique corrosion-resistance and heat resistance and Zinc-unique "Galvanic ... , and installation costs.4,Outstanding durability Colorful stone coated metal roof tile adopts imported or home-made high-quality galvalume steel as ...