Application:Replace Your Old Broken Trampoline Springs,Bring Back Bounce to Your Old Sagging Mat. High Tensile and Durable:Made of Heat Treated 60Si2Mn Steel,Compared with Other Trampoline Springs ,the Force Increased by 20% and the Service Life Increased by 50%,Raise Up to 500000 Cycles. Anti-Rust:The Galvanized Coating Provide Superior Abrasion Proof Performance,which Allows it to Maintain Excellent Strength in Harsh Weather.Especially Suitable for Wet Grass Environment. Size:5.5 Inches.(Total Length Including Hooks)Please Measure Original Springs from Hook End to Hook End before Purchase.Suitable for Trampolines from 8ft-14ft. Satisfaction Guarantee:We Hope All Customers Can Have a Satisfactory Shopping Experience..If you Meet Any Problems after Purchasing, Please Feel Free to Contact Us and We will Do Our Best to Solve the Problem. The 5.5 inches is the length of the trampoline replacement springs from hook to hook. The wire diameter is 0.12 inch. These replacement springs are a great enhance replacement for your old trampoline springs that broken or stretched out. The springs themselves are made of high-quality galvanized steel, anti-rust, unbreakable, crack-resistant, excellent resilience and durability. These trampoline springs fit perfectly for your trampoline. They are nice and strong so can hold up for long time use.Suitable for Skywalker, JumpKing, Upperbounce, Skybound. Our 5.5’’ heavy duty galvanized steel trampoline springs are widely suitable for 8ft,9ft,10ft,11ft,12ft, 14ft trampolines. Package List: 20 Pcs 5.5’’ Trampoline Springs