The Chromonica is a truly classic model of chromatic harmonica - made by the Hohner Company of Germany.
The Chromonica harmonica has a wooden comb, which means that the middle part of the instrument, the basic body of the instrument, is made of wood. Quite often these days, the comb of the harmonica is made of plastic .
There are varying schools of thought about whether it's better to have a wooden comb or a plastic comb - they definitely have their pluses and minuses. Wood, as you can imagine, reacts to humidity and swells and shrinks accordingly, a little bit. Plastic combs on the other hand don't have this problem but may not have the beautiful tone that wood has.
However, the Chromonica has been in production for several decades, and is still a really great instrument. It is not Hohner's "top of the line" anymore, but it is a good reliable instrument that you can get a "classic" sound with, and if taken care of, the Chromonica harmonica can last and be one of your favorite ins...