The thumb piano has twelve metal tongues or keys. It is primarily a percussion rhythm instrument. Simple songs are easily tapped out using only your thumbs. It is tuned to the C key. Each instrument is handcrafted. The thumb piano or marimba is easy to play and has a quiet soothing sound. By gently striking the ends of the keys with your thumbs, you can play familiar melodies and rhythms or improvise your own. It is a fun instrument to play since anything you play on it sounds good. 100% Made in USA