Expand yout possibilities! More product information Take your track to new heights with the “GraviTrax Building Expansion” set! The Building Expansion offers over 25 additional elements to expand your track vertically. You’ll increase the action when increasing the height of your run. Experiment with the combination of height tiles, base plates, freefalls, switches and even another level. See how high you can build your track before getting the marbles to the finish. GraviTrax Starter-Set required What makes a great toy? GraviTrax checks all the boxes! It’s a creative, modular, expandable track system that challenges children to use their imagination to build their own marble runs! Electronic-free, GraviTrax construction sets use STEM-friendly concepts while building critical thinking and problem-solving skills. Each set is open-ended with boredom-busting play options for hours of fascinating fun. Master the basics then simply add expansion sets and accessories to propel those metal marbles around the tricked-out track of your dreams! Comes with 2 base plates, 1 transparent level, 8 large height tiles, 4 small height tiles, 2 switches, 1 3-in-1 tile, 1 vortex, 1 finish line, 4 basic tiles and inserts (2 catchers, 1 freefall, 1 splash, 1 landing). Lasting durability for girls and boys ages 8 and up, it’s the learning toy children (and savvy adults) return to over and over again! Contents 2 Base Plates, 1 Transparent Level, 8 Large Height Tiles, 4 Small Height Tiles, 2 Switches, 1 3-in-1 tile, 1 Vortex, 1 Finish Line, 4 Basic Tiles, inserts for basic tiles: 2 Catchers, 1 Freefall, 1 Splash, 1 Landing