JumpSport 12' PowerBounce Trampoline This state-of-the-art technology improves both shock absorption and bounce performance Patented TripleStage-DualSpring assembly Incorporates StagedBounce technology with PowerBounce performance Heavy-Duty frame is made from Cold Rolled Steel that is 1.8 inches in diameter Tough Jet Black Powder Coat Finish, 10-Year Frame Warranty