GraviTrax Expansion Building - Marble run accessories Mini-Z AWD RTR thanks to her parents’ gift

thanks to her parents’ gift of 128 Crayola crayons

Reliable and easy-to-use UNITRACK snap track system makes setting up both temporary and permanent layouts a snap

Starting work as a mural designer

extra-thick cardboard backing along with our superior

Distance between mounting hole centers: 37mm

GraviTrax Expansion Building - Marble run accessories Mini-Z AWD RTR thanks to her parents’ giftThe Extension Building contains many different basic components to extend the marble run. Combined with any GraviTrax starter set, the Extension Building brings even more variety and ball fun to the GraviTrax universe. How much longer can the ball roll with the new elements? GraviTrax is a flexibly expandable, interactive marble run system for children aged 8 and over: With GraviTrax, children, teenagers and adults don't just build simple marble runs.