This comprehensive bundle includes four of our finest stem products including the force & motion activity set, simple machines activity set, magnets! activity set, and sink or float activity set. Explore the wonders of magnetism and engineering, why things sink and float, all 6 simple machines, and the science of “how things go” with colorful, engaging tools and hands-on activities and experiments. The perfect introduction to building Key science, technology, engineering, and math skills. All sets include a comprehensive activity guide with reproducible materials.