This Zip-Line Racer activity kit challenges students to create a propeller-powered device that travels along a string. The essential pieces—propellers, rubber bands, craft sticks, and string—are provided; it's up to the young scientists to determine the best materials to use in order to effectively propel their racer. Includes enough materials to begin 6 racers. 38 total pieces. Ages 8+. STEM Starters provide students with essential tools to complete hands-on projects. When combined with everyday items, these materials can be used to design and execute a project using creative exploration and the engineering design process. By approaching a problem or a challenge with this thought process, children are able to make educated guesses, problem-solve, and learn without the fear of making a mistake. Perfect for individuals or small groups.