Ideal for children and adults aged from 8 to 99 years old STEM Toy – This innovative STEM toy encourages children to explore science, technology, engineering and maths, while having fun and developing their creativity and imagination Includes: 2 x Trampolines, 2 x Angled Bases Learn about gravity, magnetism, kinetic energy and fun. Experience the power of gravity! GraviTrax is the all-new STEM track system from Ravensburger! Use your imagination to build superb tracks and set the gravity spheres rolling! Leap Ahead! Use the Trampoline to defy gravity, gain momentum, and bounce your marble through the track. Combine the Trampoline with the GraviTrax Starter-Set to add an exciting challenge to your marble run. How far and high will your marble bounce from the Trampolines? Only for use with the Ravensburger GraviTrax Starter System.