*board sheet The global structure using cold-rolled steel plate with strong security architecture and standard square tube inside. The door is anti-wind, posses the characteristic of high impact resistance. *surface The surface of electrostatic spraying process of polyurethane powder coatings. Corrosion-resistant structure design of metal components are used. The paint pieces all using high-performance anti-corrosion primer. The surface of the paint is uniform, smooth. The colour of electroplated layer would not desquamate. Anti-ultraviolet, antitarnish. With strong adhesion ande unease to powdering.