With the Ravensburger GraviTrax Looping element, you can add a spectacular flip to your marble run. The rolling marbles speed through the loop with sufficient momentum, briefly defying gravity. This physical principle provides dynamic action on the marble run and invites experimentation. In addition to the green loop element, the expansion set also includes four large height blocks to build the necessary height for the run-up. It can be flexibly combined with all starter sets and tracks of the GraviTrax system.