Cotton swabs (American) or cotton buds (British) consist of a small wad of cotton wrapped around one or both ends of a short rod, usually made of either wood, rolled paper, or plastic. They are commonly used in a variety of applications including first aid, cosmetics application, cleaning, and arts and crafts. The cotton swab is a tool invented in the 1920s by Leo Gerstenzang. Cotton swabs manufactured for home use are usually shorter, about three inches (7.6 cm) long, and usually double-tipped. The handles were first made of wood, then made of rolled paper, which is still most common (although tubular plastic is also used). They are often sold in large quantities, 100 or more to a container.