With the electronic GraviTrax Power Element Lever, balls can be repeatedly lifted to higher levels of the GraviTrax marble run one after the other. Gain height back again and again without manual intervention. The GraviTrax Power Element Lever lifts balls up to 4 height stones and automatically resets to its starting position after each ball. This allows the player to transport multiple balls to higher track levels in succession during a run. When combined with any starter set, the flow of the balls can be controlled more precisely, and the running time of the track can be extended by repeatedly achieved height. With GraviTrax, building fun knows no bounds. The free design of the marble runs and the exploration of the rolling and flying behavior of the balls sharpen the understanding of science and make gravity tangible. The STEM label on products indicates a category of games that makes science playfully accessible. STEM (Science, Technology, Engineering, Mathematics) corresponds to the German MINT (Mathematics, Computer Science, Natural Sciences, Technology).