GraviTrax Extension: Building

Add variety and length to your marble run with the Extension Building set, containing different basic components to expand GraviTrax constructions. Combined with any GraviTrax starter set, the Extension Building brings more options and ball fun to the GraviTrax universe. GraviTrax encourages free design of marble runs, exploration of rolling behavior, and hands-on experience of gravity. All GraviTrax lines and products can be freely combined and the universe can be expanded endlessly.