For children and adults from 8 years old - Ravensburger's interactive ball track system - With the GraviTrax ball track system you can build your own ball track world by creatively using the laws of gravity use the various building elements to create an action-packed course and use magnetism, kinetics and gravity to get the balls to the finish line bring - The GraviTrax ball track system allows you to discover gravity in a playful way and with various extensions it can be enlarged for limitless building and playing fun; add even more speed with the expansion sets - Combine as much as you want - because all sets from GraviTrax are compatible with each other