The Ravensburger GraviTrax Transfer extension brings new dynamics to your marble run. With the three included Transfer action tiles, marbles can be transported over long distances or considerable height differences. The set also contains six plastic tracks in various lengths to enable creative track layouts. Since this extension is compatible with all GraviTrax products, it can be flexibly integrated into existing tracks. A GraviTrax starter set is required to play. The marble run system playfully teaches physical principles such as gravity.