Klutz- The Captain Underpants Super-Silly Sticker Studio

Build Four Brilliant Balloon-Powered Racers In Air Power. Children Can Have Rocket-Propelled Fun With These Easy-To-Assemble Creations, Including A Hovercraft And An Original Klutz Balloon-Powered Rocket! The Book Comes With Every Part Needed To Make The Racers Work; Including Five Balloons, Straws, Wheels, Axles, Two Mouths Pieces And Stickers! Everything Is Explained With Clear Building Instructions And Understandable Scientific Explanations. Perfect For Budding Engineers!