Origin: Brazil. Material: Typically made of metal, gourd, or synthetic material with a synthetic animal skin head. The pictured model appears to have a synthetic body. Mechanism: A bamboo stick is attached inside the drum, perpendicular to the head. Rubbing or pressing this stick produces the instrument's characteristic sound. Size: The head is typically around 10 inches in diameter. Sound: Produces a distinctive, often described as a "squeaky" sound. Use: Common in Samba music and increasi