Trampoline springs can break if the trampoline is overloaded or if the original springs are of a poor quality. When ordering trampoline springs, please remember that they do come in different lengths. Generally 8ft and 10ft round trampolines use a 5.5 or 7 inch spring, whilst 12, 13, 14 and 15ft round trampolines will use either a 7 or 8.5 inch spring. Simply measure the overall length of an existing spring prior to ordering.
Cheap springs are probably not fully galvanised, so tend to rust and eventually break. As with any trampoline spring, we cannot guarantee that our springs will not eventually have a small amount of surface rust, but the galvanising process ensures that any rust will only be on the surface, not effecting the overall quality. To check how many springs you need for your trampoline, you can either count the metal 'D ' rings on the jump mat or count the metal slots on the top of the trampoline frame i.e. the slots in to which the springs attach.