... -quality galvalume steel as the substrates.The surface is coated with 7-layer protective ingredients of AL-Zin, macromolecule resin, ... , corrosion resistance, ageing resistance,and long service year. 5,Safe With the unique water proof, wind proof, the nailed installation design ... seasons is doable.8,Eco-friendlyGenuine eco-friendly products with the use of non-toxic harmless materials such as ...