4M Salt, and every one has worked great. This most recent kit needed the extra... in my opinion

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Build a racer and make it go using only charcoal and salt water. From the Manufacturer 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.. Read more or Check Price

Customer Reviews Purchased this product

This is my 4th kit and everyone has worked very. This kit latest need extra parts since my students accidentally invaded the first but we use it to show ... by Shannyn

Great gifts for the older crowd 6-8 years. My son had his birthday and when we gave a lot ' for birthdays . by Victoria

My daughters and I had a great time to put this together and get to know the chemical reactions. Are engaged in science by Dennis