GraviTrax is the all new STEM track system from Ravensburger! Use your imagination to build superb tracks and set the Gravity Spheres rolling! More product information Experience the power of gravity! GraviTrax is the all Contruction toy STEM track system from Ravensburger! Use your imagination to build superb tracks and set the gravity spheres rolling! Create the element of surprise! Zip along! The Zipline connects track sections to overcome long distances and varying elevations. Combine the Zipline with the GraviTrax Starter-Set for spectacular gliding action. How far will your marbles go when connected across the tracks via Zipline? This STEM system [Science, Technology, Engineering and Maths] is an ideal one to teach kids about gravity, magnetism, kinetic energy and fun. Hit a snag? Freestyle with your own track design or use the tasks and blueprints included to help you to get started in the world of GraviTrax! Are the gravity spheres stopping or flying off before reaching the end target? Time for some problem solving. Rebuild and try something different! The GraviTrax track system can be extended indefinitely with extra track packs and add-ons each sold separately. This set is suitable for 1+ players, ages 8 years and up. This set includes 1x Zipline set, 1x Long Rail, 2x Medium Rails, 3x Short Rails & instructions