The GraviTrax FlexTube element connects different heights. The FlexTube can be turned slightly in 60 degree increments to create a wide variety of shapes. In this way, the FlexTube adapts to every situation on the track and can overcome tricky spots. Combined with any GraviTrax starter set, the GraviTrax FlexTube element brings even more variety and ball fun to the GraviTrax universe.