The GraviTrax Extension Skytrax opens up new possibilities in your GraviTrax universe! Skytrax offers spectacular building fun with exciting new features. The Skytrax expansion includes the innovative Skytrax bricks with exciting new features: drop marbles through the bricks, catch them and connect them into bridges! With the slides, marbles race around the majestic towers at high speed and lots of action. In combination with a GraviTrax starter set, this expansion provides even more variety and marble fun in the GraviTrax universe. How much further and more spectacular can the marbles roll with these new elements? GraviTrax is a flexible, expandable, interactive marble track system for children from 8 years old: with GraviTrax, children, teenagers and adults not only build simple marble tracks, but also create unique marble worlds. By freely designing marble tracks and discovering the rolling behavior of the marbles, they develop an understanding of physics and gravity becomes an exciting, tangible experience. The GraviTrax universe includes three exciting series: CORE, PRO and POWER. All GraviTrax series and products can be freely combined with each other. With countless expansions with classic building elements or bricks that enable special actions and tricks, the GraviTrax universe can be expanded infinitely. Everyone can tinker, experiment and build beyond their imagination. Contents: 30x new Skytrax Trackstones, 6x different sliding pieces, 12x Skytrax Heighttones, 12x small Skytrax Heighttones, 24x connecting pieces, 1x manual 8-99 years