3 Reinforced Center Poles: The center pole of this upgraded heavy-duty party tent is made of 2'' diameter, 1.5mm thick galvanized steel pipe, and the side wall poles are made of 1.5'' diameter, 1.2mm thick galvanized steel pipe. Additional top rails provide strong support for the tent and prevent the center canopy from collapsing Flame-retardant PVC Fabric: This weekend tent uses 480GSM PVC top fabric and 350GSM PVC side fabric, which are waterproof, UV-resistant and flame-retardant. 6 transparent church windows provide ample brightness, and 2 roller shutter doors with double-sided zippers provide excellent cross ventilation. What's more, 4 individually removable side walls meet your different needs Wind Protection System: We provide 22 sets of thickened ground stakes and thick cotton wind ropes to ensure the stability of the pole tent. The side walls of this outdoor canopy tent have extended PVC covers. You can use L-shaped ground nails (provided) or heavy objects such as stones and sandbags (not provided) to fix the side walls Multi-purpose Use: Overall size: 40'Lx20'Wx13'H, door size: 6.6'Wx6.2'H. This party tent 20x40 heavy duty is a multi-purpose shelter that is the perfect tent for commercial or recreational purposes such as weddings, parties, events, and more. The spacious interior can accommodate up to 160 people Delivery & Assembly: This outdoor party tent is delivered in 3 boxes, each box contains a 600D Oxford bag for easy carrying and storage. The instructions included with the box and the assembly video in the listing can help you assemble this canopy tent easily Color: White Overall Size: 40'Lx20'Wx13'H(472''Lx236''Wx155''H) Door Size: 6.6'Wx6.2'H Item Weight: 346.6 Pounds Material: Galvanized Pipe, PVC Cloth