This type of panel is the 1990s world most prevailing roofing panel, selflock Fasteners with buckle and edge fixed are all hidden. There is no screw outside of the roofing. Installing swift and convenient, having good section characteristic, its life is raised by more than 2 times than ordinary roof. There is no seepage definitely, suitable for all roofing, stock the over the past several years main regeneration product. Cooperated with roll forming machine of curve, it can produce roofing system with skeleton.