The most popular percussion instrument in today Persian music is a goblet drum known as the Tonbak. The Tonbak is a large wooden instrument with a goatskin head. Unlike other goblet drums, this drum has a much more squared-off shape and produces lower-pitched and softer tones due to its size and skin being put on with less tension. Other names for this drum are Donbak, Tombak, Dombak, Tompak and Zarb. Maybe the name Zarb has its origins in the Arabic word darb, meaning to strike, as mentioned above. The other names have a more interesting origin. The two main strokes played on this drum are known as Ton, for a bass tone played in the center of the drum head, and Bak, for a treble tone played on or near the rim. Combining the terms results in the name Ton-Bak. It is highly likely that the American name Doumbek is derived from one of the Persian names.