Take your marble run higher and higher with the “GraviTrax PRO Expansion” set! Going up! The “GraviTrax PRO Expansion” set gives your marble run some extreme height! With 33 additional components including walls, pillars and balconies, you’ll create even more intricate tracks and suspended stunts. Combine with the “GraviTrax Pro Starter-Set” or any “Starter-Set” and boost your track to a new level, chock-full of tall towers, twists and stunts. Explore the endless possibilities and experience the amazing power of gravity and educational fun today! 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 design and build their own marble runs! Electronic-free, GraviTrax construction sets use STEM-friendly concepts while building critical thinking and problem-solving skills. Completely open-ended, every GraviTrax set has a boredom-busting variety of play options for hours of fascinating fun. Once the basics are mastered, simply add expansion sets and accessories to propel those metal marbles around the tricked-out track of your dreams! Comes complete with instructions, 8 pillars, 4 tunnel pillars, 4 walls (2 long, 2 medium) and 16 balconies.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!