GraviTrax: Building Construction Measures approximately 27 x 19

Measures approximately 27 x 19

A national symbol and until recently an endangered species

A pair of dolphins leap through the waves in tandem

Easy and hard levels keep kids interested and challenged - while of course having fun

GraviTrax: Building Construction Measures approximately 27 x 19The 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.