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. The My Trapdoor action element, like all other building components of the interactive marble run system, is made of wood bioplastic. The Trapdoor element creates a magical effect on the track when the ball is swallowed and released at a lower level. This allows even more exciting tracks to be built - for endless building fun. 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. - Elements bring more variety to the marble run - The highlight in every track - Can be combined with all Junior Starter Sets - Elements bring more variety to the marble run - The highlight in every track - Can be combined with all Junior Starter Sets 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. The My Trapdoor action element, like all other building components of the interactive marble run system, is made of wood bioplastic. The Trapdoor element creates a magical effect on the track when the ball is swallowed and released at a lower level. This allows even more exciting tracks to be built - for endless building fun. 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. Age 3-7 years packaging dimensions 11x11x6cm not suitable for children under 36 months