The Structure of the Harmonica
Materials of a harmonica

The body encased by the metallic covers is often made of plastic, but it is sometimes made of wood. The model in the photograph uses maple wood. A single board has been carved with numerous channels to let air through. Compared to other types of wood, maple is harder to chip and has excellent workability. Another benefit is that the texture warps very little even after absorbing saliva during play. It is also very responsive when played.

A body made of maple, The red color is painted on

A body made of maple, The red color is painted on

The plates and reeds are made from brass. The reeds, in particular, are made from a highly malleable alloy called reed brass that contains around 0.7% zinc.