Launch the marble through your run by adding the Magnetic Cannon. The high-powered magnet gives the marble speed to help extend your run by boosting it up inclines and down tracks. Including the magnetic cannon tile and 3 additional marbles, this accessory must be combined with a GraviTrax Starter Set. GraviTrax is a modular, electronic-free interactive track system where you can design and build your own marble runs. This STEM toy for boys and girls 8 and up, encourages experimenting with gravity, magnetism, and kinetics to propel your marble to the finish.