GraviTrax 4th Generation Add on: Propel the action! The Transfer takes your marbles over a breath-taking gap for a spectacular eye-catcher! Combine the Transfer with your GraviTrax Starter Set (sold separately) to get your marbles across longer distances. How far will your marbles travel? Age: 8 - 99 Product Dimensions: 19 x 19 x 5 cm
