Rhythm bones are one of several types of clappers classified as percussion instruments. Their name derives from their original composition "bone" and these are made of sheep bone. (Many of those found in campsites have been made of wood as well). The first settlers introduced bones into North America and they were used primarily as an accompaniment to jigs and reels. They were another popular form of entertainment for the Civil War soldier and were often used to keep the steady beat behind a harmonica, concertina, banjo or any other type of musical instrument the soldiers may have brought to camp. This pair measures 7" x 1" and is in excellent, but obviously used condition. A great addition to a camp or musical period display.