Balloon Hovercraft Problem Solving Kit, Science and Engineering Project that you Design and Build YourselfThis is a fun and challenging kit. Make the balloon power the Styrofoam square on a cushion of air! It's tricky, but you can do it. Requires placing the hovercraft on a flat, smooth surface to work correctly. Includes Styrofoam blank, balloon, fins and other hardware (Ages 12 & up). This is a fun and challenging kit. Make the balloon power the Styrofoam square on a cushion of air. Requires placing the hovercraft on a flat, smooth surface to work