Crime-Cast is a complete plaster casting mixture in a bag. This convenient, easy-to-use pouch contains everything necessary including water to make a plaster cast of an average-size shoe print. A small water bladder is enclosed in each Crime-Cast pouch. There's no need to carry around water, mixing bowls and measuring cups. Simply break the internal water "bladder," mix in the bag and pour. When dry, Crime-Cast creates a hard, white casting.