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GraviTrax Junior - Extension Trax Vehicles Tummy time feels like aTake your GraviTrax Junior marble runs further with the Extension Trax set, designed to expand creativity and building fun for little engineers. With 33 extra pieces included, kids can build bigger and more exciting tracks using base plates, height stones, bridges, straights, slopes and turns. This set encourages hands on STEM learning as children explore motion, gravity and problem solving through play. Perfect for adding new layouts and longer runs,