Watch your marble vault from pole to pole with the amazing GraviTrax Transfer!Check out this mesmerizing, chain reaction that moves marbles from one side of your track to the other! The GraviTrax Transfer balances and moves your marbles across longer gaps, propelling them from one track on to another in captivating style! GraviTrax is designed with open play in mind, so its a snap to combine this accessory with any Starter-Set. Add exhilarating action to your marble run and experience the power of gravity and educational fun today!What makes a great toy? GraviTrax checks all the boxes! Its 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 Transfer tiles, 1 long track, 2 medium tracks, 3 short tracks and instructions.Lasting durability for girls and boys ages 8 and up, its the learning toy children (and savvy adults) return to over and over again!