Trampolines made with strong, rust-resistant galvanized iron steel tubing using patented T-Section construction * Snug, secure fit of T-Section assembly ensures extra stability and prevents shifting over time * W-shaped legs with 8 balanced contact points add stability and prevent wobbling or tipping and high-performance steel springs provide deeper * The 12-foot, 72-spring trampoline is easy to assemble and requires no tools or extra drilling * Includes limited two-year manufacturer"s warranty