Skywalker 15 Foot Square Trampoline and Enclosure Skywalker 15 Foot Square Trampoline and Enclosure is designed with a heavy gauged galvanized steel frame for years of family outdoor entertainment. This fun square shaped trampoline with enclosure gives more jumping area than a traditional round trampoline. Along with more jumping surface this trampoline includes 84 large coil springs over 7 inch length plus 12 gold color springs 1 inch diameter which are placed in the center of the frame on each side to provide a superior bounce. , Easy Assembly Featuring T-Bracket Technology These trampoline and enclosure systems feature a brand new interlocking T-bracket technology, adding strength at each frame joint. The T-bracket prevents the frame from twisting and makes assembly a snap! , Safety Enclosure Net Included The stay-put safety enclosure net - pre-installed at the factory - attaches at each spring clip eliminating gaps between the jumping mat and net, which are typical concerns with other trampolines. The suspended enclosure netting system protects the jumper from falling off the trampoline.