Experience the power of gravity! GraviTrax is the all Construction toy STEM track system from Ravensburger! Use your imagination to build superb tracks and set the gravity spheres rolling! Create the element of surprise! Propel the action! The Transfer takes your marbles over a breath-taking gap for a spectacular eye-catcher! Combine the Transfer with your GraviTrax Starter-Set to get your marbles across longer distances. How far will your marbles travel? 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-on’s – each sold separately. This set is suitable for 1+ players, ages 8 years and up. This Set includes 3x Transfer Bases, 1x Long Rail, 2x Medium Rails, 3x Short Rails & Instructions