Boost their learning trajectory with an authentic catapult! Kids can build their own with planks, a little glue and the help of easy, step-by-step instructions. What shoots farther, a marshallow or a piece of macaroni? How does the object"s course change when you pull the arm back to different points? Includes pre-drilled planks, wood glue, leather strap, ruler, rubber bands, cup, 2 balls, target mat, fasterners and instructions.