Even more action with the Element Vertical Cannon. This action element allows you to overcome spectacular height differences. Experience a new dimension of marble run action with the Vertical Cannon! This element spectacularly overcomes height differences. A strong magnet provides an exciting chain reaction: once a ball rolls in at the lowest level, it triggers another ball that continues to roll at impressive height. Combined with any GraviTrax starter set, the Vertical Cannon brings action into the track and playfully shows the laws of physics.