Superstructs Classroom 300 teaches the mechanics of Levers, Pulleys, Gears, Wheels and Axles. The set is designed for all levels, from young learners to advanced physics students. Discover the 3 classes of levers. Explore weight distribution with pulleys. Learn ratios by building with gears. Superstructs' large, easy-to-handle pieces allow students to quickly build, see and feel how simple machines work. Set includes 300 pieces and a building guide in a heavy-duty reusable cardboard storage box.