Your children will have a place for hours of playtime with this safe and strong 15-foot trampoline. This product features numerous safety applications to ensure that children remain happy and well. In fact, it meets the stardards of American Society for Testing and Materials (ASTM). There are NO gaps which a child could fall through due to the safety of the trampoline's design. Jumping, suspension and safety is made possible by 96 tightly-coiled rust-resistant steel springs connected around the exterior of the enclosure net. Let your kids enter the trampoline and just zip up the ade of high-quality polyethylene netting enclosure to keep them safe inside. Each element of this trampoline is designed to withstand the outdoors. The spring pad and steel frame both utilize weather resistant materials. Jumping surface: 141 sq. ft. Assembled Product Dimensions: 15' x 15' x 9' Recommended for: Ages 6+ Steel Tubing Diameter: 1.7 in. (42 mm.) Gauge of Steel: 16 gauge (1.5 mm.) Number of Springs: 96 Warranty: 3-year limited warranty on trampoline frame, 1-year limited warranty on other materials