- Extensions can be combined with all Junior Starter Sets - Themed sets include cute decorative elements and animal figures to decorate - Ideal extensions for children aged 3 and up, with many components 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 create their own themed worlds. With a large number of desert elements and animal figures, children experience the world of the desert up close. All building and decorative elements are made of 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 can build their own marble run world to their heart's content and decorate it with all sorts of different themed sets. Creative building and playing fun are combined. 28 parts: 8 large curves, 9 3D decorative elements, 2 paper animals, 3 base plates, 6 decorative caps age 3-7 years packaging size 22x22x5cm not suitable for children under 36 months