The Megacast mold flask is sturdy cast iron vessel that is ideal for use with any Quick Cast Sand Casting Clay. Measures: 4-3/4" x 3" x 2". Safety First: Always wear high heat-resistant gloves and face protection. Intended for adult use only. This method allows you to virtually duplicate dimensional objects (such as ancient coins, toys, wax, wood, plastics, etc.) with gold, copper, bronze, or silver using this reusable clay. Great for jewelry making. The molds can be made from objects composed of wood, wax, epoxy, plastics, and metal.