GraviTrax Add on TransferThe GraviTrax Add on Transfer is an expansion item that can be combined with the GraviTrax Starter and Pro Set. Propel the action! The Transfer takes your marbles over a breath taking gap for a spectacular eye catcher! GraviTrax is a STEM interactive marble run that allows players to design and build tracks, whilst experimenting with gravity, magnetism and kinetics to explore endless possibilities and infinite creativity. Create action packed track