Constructed primarily of brass with an ABS plastic comb and topped with stainless steel cover plates, this harmonica packs an impressive 3-octave range into a diminutive 4.1-inch frame that easily slips into your pocket for your next gig or trip down to the crossroads. The Hohner Big River Harp Harmonica is also available in a wide range of keys for easily matching any ditty you or the band want to play.