Future mechanical engineers supercharge their STEM learning while assembling 5 cool solar-powered robots! The easy-to-use building system and step-by-step color manual allows clever kids to assemble 5 different robot bases at the same time. They'll be impressed as they discover how solar energy powers their robots to walk, drive, crawl, and spin. Contains 123 pieces and 36-page manual. Recommended for ages 6 and up with help, or 9 and up for independent play