The GraviTrax Element Adapter Set allows children aged 8 and up to connect their GraviTrax tracks with the GraviTrax Junior worlds. Fun for both young and old. With the GraviTrax Element Adapter Set, the GraviTrax universe can be combined with the GraviTrax Junior world. With just a few adapters, the ball rolls from the GraviTrax world into the GraviTrax Junior world and vice versa – creating even more exciting track layouts. GraviTrax is an interactive marble run system for boys and girls aged 8 and up: with GraviTrax, children not only build simple marble runs but create entire marble run worlds. The building plans included in the starter set make it easy to get started, after which creativity knows no bounds. By freely designing the marble runs and exploring the rolling behavior of the balls, children sharpen their understanding of science and experience gravity up close. The STEM symbol on Ravensburger products indicates a category of games that make science fun. STEM (Science, Technology, Engineering, Mathematics) corresponds to the German MINT (Mathematics, Computer Science, Natural Sciences, Technology). With various expansions, children can enlarge and redesign their marble runs repeatedly – ensuring long-lasting fun. Warning: Caution. Small ball(s). Choking hazard.