This KNEX Education STEM Explorations Roller Coaster Building Set makes it fun for middle-school children to explore STEM concepts while building a working roller coaster. This 500-piece set includes a battery-powered motor and is designed for a single child or team of two to three children to build a working roller coaster, plus two additional models. Once built, a downloadable booklet guides students through three hands-on, inquiry-based experiments on each of the models. Students will learn about the relationship between time, distance, and speed, plus more. The experiment guide is aligned to national STEM standards and appropriate for grades five through nine. This STEM roller coaster building set requires two AA batteries (not included).