GraviTrax Junior is an interactive marble track system with GraviTrax, children build their own tracks and create themed worlds through creative decorating in a playful way.  The GraviTrax Junior Starter Set XXL includes everything you need to start building right away and enter the world of the jungle, the ice, the desert and the ocean.  Sparks imagination and encourages active play, making GraviTrax Junior an ideal gift for children year-round. Ages 3 to 7 years