... .3, High quality frame: the main structure is high intensity aluminum alloy, accessories are hot- galvanized. The whole structure is super ... .9m4, Profile of frame: D.53, thinkness 2mm. With cross reinforcement in the middle.Hard pressed extruded high intensity aluminum alloy with ... prevent the hotness, sunlight and the UV-ray.6, The side cover, window, door, lining and other accessories are optional.