The Learning Resources Gears! Gears! Gears! Machines in Motion building set offers a creative construction experience with 116 colorful pieces. Children can design and assemble their own moving machines. The set includes a variety of components such as gears, propellers, chains, and connectors that easily snap together. Turning the crank sets the interconnected gears and modules into motion. This construction toy supports an understanding of simple physical principles and cause-and-effect relationships while playfully promoting fine motor skills during building.