GraviTrax goes vertical with the GraviTrax PRO Starter Set. With 149 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. Recommended 8+.