The Ravensburger GraviTrax Transfer expansion brings new movement to your marble run. As soon as a marble rolls onto the transfer element, it is transported further, overcoming height differences along the track. The set contains three transfer elements as well as instructions and can be flexibly integrated into existing GraviTrax tracks. This accessory is ideal for modularly expanding existing marble run systems and playfully exploring physical principles such as gravity. The elements can be easily combined with all starter sets.