The GraviTrax Extension Building Pack brings more possibilities and fun to the GraviTrax track. This expansion pack includes over 25 components to extend the fun of your GraviTrax with new bases and levels to experiment with. Build new routes and create crazy trick shots, expand the marble run with new ideas and expansion sets to keep the ball rolling. It is compatible with all GraviTrax & GraviTrax PRO sets & accessories. Experiment with gravity to power your ball through twists, loops and turns in a race to the finish line. A GraviTrax Starter Set is required to use expansion packs & accessories. The product is made with premium quality materials adhering to the highest UK and EU standards and regulations. No batteries required.