A Mizrāb (Mezrāb) is a plectrum which is used for several Iranian and Indian string instruments.
For Sitar, a mezrab is worn on the finger of the player. It is a plectrum made by hand from a continuous strand of iron used to strike the strings of the sitar. Although it is generally worn on the index finger, a second mezrab is sometimes worn on the middle or little finger.
The mezrab fits tightly on the end of the finger so that it does not move while playing.