Shruti Boxes 13 Key - Full Chromatic Scale (A=440 Hz)This listing comes with one Shruti box and a padded carrying bag. The Shruti Box is a hand pumped reed instrument used to provide droning chords and notes in classical Indian music. It is often used as an accompaniment for the voice or a lead instrument, like the flute. The fixed, droning nature of the Shruti Box is perfect for tuning the voice or for exploring the notes in a given key scale. The exterior is made of wood, with cloth bellows and reeds