This Stem toy includes 2 vehicles powered by the chemical reaction of salt water and charcoal for kids ages 5+ to enjoy hands-on learning experience. Powered By Green Energy: No battery needed, the green toy is powered by the chemical reaction of salt water and magnesium sheet,and is safe and non-toxic. This amazing science experiment includes 2 racing vehicles, necessary components, accessories, and easy-to-follow instructions. Discover a racing world of green energy.
