Bring the fun of the beach indoors with the Sand Alive! Castle Set. With a roller included, children will delight in making sand castles without the mess involved with sand. This Sand Alive! substance is easy to clean and made of a natural, organic compound. It's both safe and simple to clean up after playtime! Pack the sand hard and watch it flow through your child's fingers. This is the new way to have beach fun inside in a safe and clean way.