Professional aluminum folding gazebos fit for commercial use and outdoor events. This is 37 series, features as following: 1) Structure: 37 x 37mm oxidized aluminum tube, 2.0mm thickness, Fiberglass high strengthened nylon connectors 2) Fabric: 500D oxford polyester, PVC coating 3) Accessories: side walls, rain gutter, bars, sand bag, base plate, holding system, junction system 4) Sizes: 3 x 1.5m, 3 x 3m, 3 x 4.5m, 3 x 6m, 4 x 8m, 4 x 2m, 4 x 4m