1steel or aluminium both available! 2engineer plastic nylon parts 3power coated steel frame 4high strength nylon connector Heavy duty aluminium frame for folding tent1.nylon connector ,square / hexagon poles 2.400/500 denier polyester ,PU coating ,UV -prevented,flame retardant,waterproof.3.Material :High reinforced Aluminum , steel 4.Easy install an dismantle5.specialized in:dye-sub printing, ...