Launch your ball through your track with the amazingly powerful GraviTrax Magnetic Cannon! Simply place two balls in front of the Cannon; when your ball hits, it sends the front ball blasting down the track! A high-powered magnet gives the ball a burst of speed to help extend your run up inclines and down tracks. A great addition to any GraviTrax Starter set; comes with three additional colored balls. Experience the power of gravity and educational fun today! GraviTrax is a creative, modular, expandable track system that challenges children to use their imagination to design and build their own ball tracks. Electronic-free, GraviTrax construction sets use STEM-friendly concepts while building critical thinking and problem-solving skills. Includes one Magnetic Cannon, three colored marbles and instructions.