Here’s what Meinl say:
MEINL Percussion Darbukas are made in the tradition of the original, esoteric goblet-shaped drums found in music from Eastern Europe, the Middle East and Southern Asia. Our darbukas are constructed from thin shells in various metals, each metal giving the different models their special timbre. The head is secured and tuned with external rings set close to the shell, in the Turkish-Style. Light yet powerful, the darbukas have a deep full bass. They are well suited for high-pitched snapping sounds as well as a wide range of articulated “doum” and “tak” strokes.