- Extensions can be combined with all Junior Starter Sets - Themed sets include cute decorative elements and animal figures for decorating - Ideal expansions for children aged 3 and up, with many parts GraviTrax Junior is suitable for children aged 3 and up. Boys and girls build their own marble run worlds, which can be freely supplemented with decorations to build their own themed worlds. With a large number of ocean elements and animal figures, children experience the underwater world up close. All building and decorative elements are made from wood-bioplastic. Building and playing fun are combined in a unique way! GraviTrax Junior is an interactive marble run system for children aged 3 and up. Children build their own marble run world to their heart's content and can decorate it with all sorts of different themed sets. Creative building and playing fun are combined. Contents 28 parts: 8 Large curves, 9 3D Decoration elements, 2 Paper animals, 3 Base plates, 6 Decoration caps Age 3 to 7 years Package dimensions 22x22x5cm Not suitable for children under 36 months