Setar (Persian: سهتار, from seh, meaning "three" and tār, meaning "string") is a Persian musical instrument used across Greater Iran and Central asia. It is a member of the lute family, which is played with index finger of the right hand. Two and a half centuries ago, a fourth string was added to setar. it has 25 - 27 moveable frets which are usually made of animal intestines or silk. It originated in Persia before the spread of Islam.