- 143 parts to build unique, fully-functioning replicas of real-world gear models: a crank fan, an egg beater, and a car window
- Includes 3 after-build experiments that teach STEM concepts like gear ratios, rotational speed and more
- Easy-to-follow, step-by-step building instructions included
- All teacher guides and experiment guides are aligned to national standards, including ITEEA, NSES, NCTM, NGSS and Common Core
- Recommended for grades 3 to 5, one set is recommended per two students
