NOTE: Please confirm the size you need before purchasing!!! Suitable for trampolines from 8 feet to 14 feet. Package includes: 72 x trampoline springs 1 x T-hook spring pull tool. Enough to meet your daily use and replacement needs. The T-hook spring pull tool makes it easier and more convenient to replace broken springs. Sturdy material: Made of quality galvanized steel, not easy to rust, wear or tear. Strong tensile capacity: Trampoline spring design has a waist drum, wider in the middle and narrower at the ends, wider diameter for more bounce, and has better tensile strength and elasticity than the straight trampoline. Maximum grip: One end of the hook is curved at an angle that provides the good hold.