Based on Leonardo's historical Codex Atlanticus sketches in the 1480's, this working wood catapult flings a soft clay ball over 12 feet! Great for school projects, hobbyists, and those who like to fling things! Historically accurate, it is easy to assemble for ages 9 and over, and once finished will provide hours of educational fun in testing the distance of the clay balls (included) and other items you can find around the house (tin foil balls, cotton balls, styrofoam balls etc. ). All pieces pre-cut and precisely drilled, even glue is included. Great for enquiring minds and multigenerational projects. Can be built in about an hour or two.