The Kalimba (or Karimba) is an instrument originally from Africa that is usually played as an accompaniment to vocals, though it can be played on its own, too. It is very easy to play by plucking the keys with both thumbs.
This thumb piano is made from half of a coconut shell, and can be tuned to different scales by adjusting the length of the metal strips and the pressure bar.
Bali, Indonesia
Dimensions: 7" x 6" x 2"