SkyBound Standard Series Trampoline Springs, 7.0 Inches Thickest Steel of Any Springs Available! Don't Be Fooled by Others' Thin Steel! More Coils for the Same Spring Length - Don't Be Fooled By Others' Long Hooks & Few Coils! Widest Diameter Avaialble! Universall Compatible with All Trampolines! Full 30 Day Warranty on All Products!