Moon sand. Just 8 cups of flour and 1 cup of baby oil, really soft and easy to clean up. This summer on our patio! Sheba's opinion: THIS WAS A HIT!!! I will make this anytime I have kids over. It's not gritty, cleans easy...love, love, love this!! I made 16 cups worth and put it in a 25 gal plastic storage bin with a lid. PERFECT!!