About This

• 5-in-1 engineering kit: build five, fun functional models including a rescue copter, aircraft launcher, hand mixer, spinner toy, and centripetal force machine.
• Learn about gears and transmissions as you assemble and experiment with your models--no batteries required!
• Includes a 24-page, full-color manual with clear language, simple step-by-step illustrated instructions, and scientific explanations.
• Entertaining, affordable, and educational purchase--great birthday gift!
• For ages 6 and up