Product Detail 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 . The "Pure Fun 12-Foot Trampoline" is best product for you. We recommended Pure Fun 12-Foot Trampoline