that other link someone posted was garbage. it was still a circle tramp. bah. for the real thing, check out www.reboundproducts.com
for professional competitive trampolines. we're talking fold up frames and ross beds and springs. if you have any questions about competitive tramps, msg me as i'm rather knowledgeable about this type of thing. i have a 14x7 ross bed on a nissen frame at home as well this other 5x10 tramp that i scored from a friend. in ground pool when i move in a month too. my crew has the goods when it comes to freestyle trampolining.