Children expand their STEM skills and explore how sunlight can be converted to electrical energy with this easy-to-use kit! Kids just use the materials from the kit—along with their own plastic sheet or recycled soda can—to build one of two solar rovers that can explore the outdoors—battery-free! Kit includes 25 pieces needed to assemble a rover, plus a detailed assembly guide. Transparent chassis body measures 7 3/4" long.