The Berimbau, a Brazilian musical instrument, is a musical bow of African origin. There are three models of berimbau: the berra-boi or gunga which has a low sound, the medio or gunga which has a medium sound and the violinha or viola which is the highest of the three. The berimaubau consists of a curved stick made of hardwood (biriba) or bamboo, a steel wire stretched between the ends of the stick, and a dry gourd hollowed out and opened (the cabaça or coité) to serve as a sounding board. A wooden stick, usually a few dozen centimetres long, is used to strike the metal string and the dobrão (vintem or pedra), a metal coin or a stone is put in contact with the metal string to give effects. The musician often holds a caxixí, a gourd-bottomed straw rattle, in the same hand as the drumstick. Today it is mainly the main instrument of capoeira (or moringue, a cousin of capoeira in the Indian Ocean), but it is also used in other forms of Brazilian music.