With the GraviTrax Element trampoline, the ball bounces over the built GraviTrax track. In this way, obstacles and height differences on the track can be overcome impressively. If a ball falls onto the trampoline, it bounces directly to a higher level and defies gravity. Combined with any GraviTrax starter set, the Element trampoline brings completely new momentum and energy to the ball track. GraviTrax is a flexibly expandable, interactive marble run system for children aged 8 and over: With GraviTrax, children, teenagers and adults don't just build simple marble runs. They create unique marble run worlds. By freely designing the ball tracks and researching the rolling behavior of the balls, the understanding of science is sharpened and gravity can be experienced up close. The GraviTrax universe includes three exciting lines – CORE, PRO and POWER. All GraviTrax lines and products can be freely combined with each other. The GraviTrax universe can be expanded infinitely through countless expansions with classic building elements or stones that enable special action and tricks. This means everyone can tinker, try things out and push themselves further. In the set: 2 trampolines, 2 blocks and instructions