Trampoline Part Store&reg; 6 1/2" *Ultra-grade* Trampoline Springs, Quantity of 10 Trampoline Part Store 6 1/2" Inch Trampoline Springs, Extension Spring, Farming, Ranching, Machinery, Maintenance, Home Repairs Top Quality (35- Coils) Trampoline Springs, made for the ULTIMATE, EXTREME BOUNCE!! Quantity of 10- Per Pack The Outside Diameter of our Springs are 1.1 inches, we use 8-gauge high tenacity steel piano wire, The Wire Diameter of our Springs is 0.125 of an inch thick (1/8 inch). The Measurement is Over The HOOK Will fit any Trampoline or anything else requiring the specific spring length shown, Plus or MINUS up to 1/2 inch Replace your Springs with a set of our Made in the USA Springs