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 maths 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. The experiment guide is aligned to national stem standards and is appropriate for grade levels 3-5. Size H22.86, W5.08, D22.86cm. For ages 8 years and over. WARNING(S): Not suitable for children under 3 years old. Only for domestic use. To be used under the direct supervision of an adult.