a)The base of colorful stone-coated metal roofing tiles is galvalume(0.4mm thickness), as well as vermiculites processed by high technique on its surface. The multi-layer design is environment friendly as well as being in modern style. b) Compare to the galvanized sheet, galvalume is more durable, heat-resisting, heatproof and anti-corrosion. It is generally believed that steel sheet can guarantee 30 years without being rusted or eroded in various conditions. c) The colorful vermiculite has been processed at high temperature, thus to be brightly-colored, and never faded.