Defy gravity! Even more new components - even more possibilities! The new GraviTrax PRO Starter Set has everything you need to build a truly outstanding track. Place your track components where you need them and save on elevation stones. Build tracks at different levels, above and below each other, and have tracks run through pillars instead of around them! The additional components in this set make building even more flexible. Discover even more exciting components that perfectly complement the new vertical building style. Defy old boundaries and create new ones! 153-piece set. With the GraviTrax ball track system, you can playfully explore gravity, and with various expansions, it can be expanded for endless building and play fun! Add even more speed with the expansion sets.