2 years & up. Encourage children to explore their creativity as they build and discover basic engineering skills. Assemble structures using squares and triangles and add gears by simply pushing them into place. Once connected, turn one gear and see the rest of them rotate! Contains 58 durable, lightweight plastic pieces suitable for indoor and outdoor use. Includes: 24 squares, 4 triangles, 10 square gear panels, and 20 gears.