A recommended 10 hole pro model. The Special 20 has been a mainstay for harmonica players for nearly forty years. With airtight reed plates and a black UPVC comb, this harp is beautifully responsive, with a warm tone. A definite upgrade! The channels are standard gauge, which promotes rapid movement around the instrument, while the standard harp size means easier use of hand effects. The Special 20 is supplied in all major keys.