Want to build fun solar-powered vehicles and devices that move using electricity generated directly from sunlight? With the Thames & Kosmos Solar-Powered Rovers kit, you can construct five motorized models. Build three types of solar cars, a solar fan and a solar robot model. Conduct science experiments with each model to learn about gear ratios, solar cells and more. The ultralight materials, including strong bamboo rods, make your models speedy and durable. A modular gearing system lets you test out three different gear ratios.