Build your own racer with our 4M Salt Water Power Robot Kit. Powered by using charcoal and salt water. Detailed instructions included. Award winning Green Science introduces kids to green concepts such as repurposing, upcycling and alternative energy. Construct a race car that employs the principles of the rocket with our 4M Rocket Race Car Kit. Powered by water and air pressure. You supply the plastic bottle; all other necessary parts and instructions are included. Turn a metal can into a walking, wobbling, bog-eyed robot that can move. It can be transformed to become a robotic monster too. Cans can be cool! Kit includes parts and instructions, just add a “can” do attitude. Watch your child’s delight and sense of accomplishment with the robot they create. Great for the “science” enthusiast in your family. Requires two AAA batteries (not included). Recommended for 8 years and up.