North East India
Indian

Wood, metal, fiber string/rope, hide
Late 20th century
Top head Diameter: 5.8 in; Bottom head Diameter: 5.1 in; Width: 6.75 in
Chordophones – Musical Bows 

The khamak belongs to a variety of stringed instruments used for rhythmic purposes.  It originated in India, and is particularly common in folk music of Bengal Baul (folk) songs, Odisha and north east India.  This instrument consists of a small wooden drum with only one side covered with skin.  A string is passed through the center of this skin head and fastened to a small tab/knob to prevent it from slipping out when the string is in high tension.  The other end of the string is taken through the inside of the drum and tied to a small piece of wood or as seen here, the modern version of a metal cup mute.

The player holds the body of the instrument under their left arm while their left hand controls the tension of the string.  With a plectrum held in their right hand they briskly pluck the string.  The fundamental tone produced fluctuates depending on the tension applied to the string.