Challenge your budding engineer to build more with this 150-piece super set. The giant storage tub of colorful, spinning gears will put creativity, motor skills, and hands-on construction play to the test. So get ready to snap these sturdy plastic pieces into place and create something amazing with this engineering toy. Compatible with all other Gears! Gears! Gears! sets for even more imaginative fun. Includes 66 colorful gears (blue, green, orange, red, purple), 36 square pillars, 31 six-way axles, 8 pillar connectors, 8 interlocking bases, 2 crank handles, 1 plastic storage tub and an activity guide.