8 years & up. Experience the power of gravity with the Gravitrax Trampoline Expansion Set! Add the Trampoline to the Gravitrax Starter Set and change up your marble run experience from racing to bouncing. The Trampoline features specifically angled height tiles and spring trampoline tiles that send your marble bouncing its way to tracks on the other side. Included: 2 Trampoline Tiles and 2 Angled Height Tiles. Gravitrax Starter Set not included.