SCIENCE BOX KIT SIMPLE MACHINES A fun and informative science kit that lets you conduct simple experiments. Explore the natural forces that surrounds us. Each kit contains materials to create illuminating scientific experiments. Use them t o study the natural properties of simple machines. For ages 7 and up. Not recommended for children under 3 years of age because of small parts that may become a choking hazard. The Science Box Kit measures 4.5" x 5".