These hand-hammered cups are made by an international cooperative of master copper artisans, with workshops in Austin and Santa Clara del Cobre, Mexico. Made from 100% recycled copper, each piece is made to last a lifetime. The tumbler is ideal for Moscow Mules or other cocktails, but it also makes a superb water or beer glass. Copper is an inherently clean material with antibacterial properties, it never changes the flavor of beverages. The copper is unlacquered and will age with time and use to a beautiful rich patina. Hand wash only. 12 oz.