Most modern congas have a staved wooden or fiberglass shell, and a screw-tensioned drumhead. They are usually played in sets of two to four with the fingers and palms of the hand. Typical congas stand approximately 75 centimetres (30 in) from the bottom of the shell to the head. The drums may be played while seated. Alternatively, the drums may be mounted on a rack or stand to permit the player to play while standing. While they originated in Cuba, their incorporation into the popular and folk music of other countries has resulted in diversification of terminology for the instruments and the players. In Cuba, congas are called tumbadoras.