Dombak / Donbak / Tombak / Tonbak or Zarb:
It is the chief percussion instrument of Persian classical music. It is a one-headed drum carved from a single piece of wood. It is placed under the player's arm and held in-between the fingers of his two hands. Its body is made from wood, ceramic or light metals. But wood is the most convenient material. Tombak is comprised of various sections including the hide, a big mouth and a small one. It is the only percussion instrument in the world that might be played by making full use of all the fingers of both hands. It became known as Tombak during the reign of the Sassanids. It is placed horizontally on the player's leg and is played by two hands in a special way. The tune played by Tombak has no definite pitch, but as far as its playing technique is concerned, it is one of the most advanced instruments which its structure contains hide.