Model big air bounce 8ft trampoline with safety enclosure introducing the big air bounce new for 2015 the big air bounce series is our 3rd generation of big air trampolines working directly with the manufacturer we have been able to make positive refinements on these trampolines including better and stronger trampoline joints a more efficient spring system and heavy duty enclosures specifications diameter 8ft 244m frame height 59cm springs 48 standard big air springs frame 12m