Slick Sand is hydrophobic sand with the same properties as sand on Mars. And it never gets wet: put it in water and take it back out, Slick Sand stays completely dry! Use it to make underwater sand sculptures, clean up oil, improve plant growth, and much, much more. Slick Sand is currently being used in NASA Mars Exploration Classroom Experiments. This kit comes complete with 56 grams each of orange, purple, and green Slick Sand.