One of the developed version of the tanbur originating from pre-Islamic period of Iran is Setar (in the foreground) with three strings. However, this instrument modern version has four strings. The forth string was added by a Sufi named Moshtaq Ali Shah in 18th century. The body of this small instrument is either made from a single piece of wood or it is made from some pieces of wood stabilised to each other by nails. Setar is played bu using the index finger of the right hand without a plectrum. It is a very respected instrument in Iran and it become common among the Sufis in mystic environment firstly.