GraviTrax Expansion Trax SMX226US with a comfy air mattress

with a comfy air mattress

Invented in 1974 by Ernõ Rubik

All our EzyRollers have a 2 year warranty on the frame

After entering the secret combination

Take to the woods in style with this distinctive fashion accessory

GraviTrax Expansion Trax SMX226US with a comfy air mattressThe Extension Trax contains many different basic components and 6 balls to extend the ball track. Combined with any GraviTrax starter set, the Extension Trax 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