This set helps to teach potential and kinetic energy, Inertia, force, speed/velocity, friction, and motion. The concepts are fashioned around national standards in science, technology, engineering, and math. The set includes a comprehensive teacher's guide and building instructions. Made in the USA. Build up to 11 models (1 at a time). Ages 9 and up. Sold by Gryphon House, Inc. Ships from Kaplan Early Learning Company.