With robust high-strength aluminum alloy structure and double PVC tarpaulin synthetic fiber, the tent is safe and firm. The conventional width of this tent is 8 m, 10 m, 12 m, 15m, 20 m, 25 m, 30m, 45m ,with the bay Infinite extension in multiples 3 meters. Windows can be added to make sure the tent have plenty of sunshine, fresh air and space.