Explore STEM concepts while building different geared models Using the materials included in this set, elementary-school aged children will be engaged and energized as they further their knowledge and understanding of science, technology, engineering and math concepts. The set includes 140+ parts for a single child or team of 2 children to build 3 unique geared models: a Crank Fan, a Car Window and an Egg Beater. Once built, a downloadable booklet guides students through 3 hands-on, inquiry-based experiments on each of the models. Students will learn about gear configurations, gear ratios, rotational speed, mechanical advantage and more The Experiment Guide is aligned to national STEM standards and is appropriate for grade levels 3-5.