This is special FX grade Alginate; an organic water based molding powder made from sea grown kelp. It is used for making single-use molds of larger body parts including faces, heads, and torsos and craft molds where high tear resistance and low mold shrinkage is required. Sets to a firm rubbery consistency, providing high detail down to figerprints when cast. This molding powder is: Highly tear resistant, shrink resistant, skin safe, food safe, safe for fast set resins, superior for detail, water based, and cleans up with warm water. It mixes to a creamy consistency for easy application and sets in 5-6 minutes. Comes in a one pound box.