Do you like to play with marbles? If you do, then this is the big time problem solver for you! Make a wheeled vehicle that is powered by marbles!!??!! Sounds impossible, but it can be done. This is an advanced kit that is a great group activity for science competitions or Rube Goldberg type events. Includes wood chassis, wheels, axles, wood, paper and all the hardware to construct your ultimate vehicle (Ages 12 & up).