Thumb Piano Mbira Music Story Telling Instrument By Xgunion (Red) Thumb piano is in small size, easy to carry. Sounding bar: 10 pcs in different length Item Size: 17 * 12.8 * 2.9cm / 6.7 * 5.0 * 1.1inch Material: aluminum bar, aluminum rod The main function of thumb piano is used for accompaniment