Andoer 10 Keys Birch Finger Thumb Piano Mbira Pushes down on a key with a thumb or finger, and when the key is released, the vibration resonates in the wooden body, making nice sound. Anyone who picks up one of these instruments can make a great sound right away. Smooth surface, nice polish, very beautiful and delicate. Small in size, easy to carry and store. Material: Birch & Steel