Beer casks are containers used to store and transport beer. Coopery is the craft of making barrels and other wooden containers, such as beer casks. Kegs are metal or plastic containers that hold beer and are often used in bars and pubs. Oaken is a term used to describe wooden containers, such as beer casks, made from oak wood. Solera is a method of aging beer in which a portion of the beer is removed and replaced with a younger beer. Rums are alcoholic beverages made from sugarcane byproducts, such as molasses, and aged in wooden barrels, such as beer casks. Tuns are large wooden barrels, such as beer casks, used for storing and transporting liquids. Staves are the narrow strips of wood that form the sides of a barrel, such as a beer cask.