2.4-inch diam. frame rails with 12 gauge steelWelded T-sockets secure enclosure frameButton-hole feature attaches enclosure netting to jumping surfaceAssembled dimensions: 15L x 15W x 9H ft.Recommended for age 6 and older; 250 lb. weight capacityASTM certified1-year limited warranty on frame; 90-day on materials. The Skywalker Trampolines 15-ft. Square Trampoline and Enclosure Combo is your kids' ticket to fun. Safety is top of mind when it comes to Skywalker, so you can rest easy whenever kids are jumping. The frame rails are 2.4 inches in diameter with extra thick 16-gauge rust-resistant galvanized steel wall thickness, offering real sturdiness. Welded t-sockets secure the enclosure frame to the trampoline frame, which eliminates frame twisting and strengthens each frame joint. The stay-put enclosure net interlocks to the jumping mat by using a patented button-hole feature. This attaches the enclosure netting to the jumping surface at each v-ring, away from the springs and frame and eliminating gaps. For ages 6 and older.