The Springfree 8ft x 13ft oval trampoline is a revolutionary trampoline designed with safety in mind. Unlike most trampolines the Springfree uses 54 composite rods to create the bounce this removes the old risk created by springs & makes a fully risk free trampoline area. Also to increase safety this trampoline has a hidden frame removing another risk normally associated with traditional trampolines. Flexi Net Enclosure. The Flexi Net Enclosure is another way in which the Freespring reduces risk, unlike most enclosures the net uses flexible net rods to cushion jumpers & prevent falls. Spring based trampolines usually use steel rods to fasten the net this reduces the risk of falling off however jumpers can collide with them.