Key of “C” only. This is not your standard Marine Band harmonica. It is a complete octave lower than the normal 10-hole variety and has 12 holes instead of 10.
Dave Gage Review: This harmonica in “C” was used on occasion by Sonny Boy Williamson II on tunes like “Bye Bye Bird” and others. We like it a lot for practicing scales and bending. It’s like jogging with ankle weights on, it helps increase your power and endurance. It also makes a great rhythm instrument when jamming with another player using a standard key of “C” harmonica.