his rectangle trampoline offers the greatest control and overall rebound action. For skills, this is the official shape as recognized for gymnastic training. The frame is 13 gauge, 3" diameter galvanized steel, with double support rails standing 36" high, competition 9" tapered German cross link springs, and welded loop construction. Royal blue 13" wide safety pads include loop straps on the back side of each safety pad to keep them from flapping. 6'x12' mat , 9'x15' frame.