Explore the possibilities of connecting separate tracks with the “GraviTrax Bridges Expansion” set and get your marble over any ravine! Balance your marble on the narrow bridge that resembles a tight rope; control the marbles speed with the slow bridge; or roll out a new path for your marble to take with the roll-out bridge. It’s a snap to combine this accessory with any “GraviTrax Starter-Set” to experience the 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 3 adjustable-length Bridges, 2 long thin tracks, 2 long slow tracks, 1 long track, 2 medium tracks, 3 short tracks and instructions. 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!