Diatonic harmonicas have 10 holes with the middle four producing a full octave. Provides expressive bending and overblowing effects.

The reeds of Diatonic Harmonicas produce the notes of the scale to which they are tuned. 10 hole, 20 reed diatonic harmonica. 4" long. Key of C.

Hohner Blues Band-10 Hole, Key of C only. The reeds of Diatonic Harmonicas produce the notes of the scale to which they are tuned.