A castanet is a percussion instrument made up of two pairs of concave shells joined together by a string on one side. held in both hands, it is snapped together to produce clicks, providing a rhythmic accent akin to a rapid series of rattling or ripping sound. It is traditionally made of hardwood, but the modern version is usually made of fiberglass.
The castanet is played while singing and dancing the flamenco. It is widely used in Spanish, Latin American, Moorish, Ottoman, and Roman music.