GraviTrax goes vertical with the GraviTrax PRO: Starter Set Vertical. With 153 elements that include unique components, this set offers everything you need to begin building your own vertical action-packed track systems. Build with walls, pillars and balconies that can be attached together to form three-dimensional structures. The elements can be integrated seamlessly with existing GraviTrax sets, allowing you to create more dynamic marble runs. The pillars have special notches to connect them with the transparent walls and create more intricate paths for the marbles. Suspend your tracks in air with the balconies. GraviTrax is a modular interactive track system where you can design and build your own marble runs. This STEM toy for boys and girls 8 and up, encourages experimenting with gravity, magnetism, and kinetics to propel your marble to the finish. Designed with open play in mind, the concept offers endless possibilities to design a different track every time you play. Expand your builds and add some action with a variety of expansion sets and accessories.