Hohner 550/20 C Puck Mini Historic HarmonicaA novel Hohner beginners diatonic harmonica in the key of 'C'. Named after the mischievous sprite from Shakespeare's 'A Midsummer Night's Dream', this petite harmonica has stainless steel cover plates, brass reed plates and a plastic comb. Less than three inches long, the bright sounding Puck is small enough to tuck into even the smallest shirt pocket! Specifications Sound Diatonic Reeds 20 Reed Plate Brass, 0. 9mm Keys C Major Comb Plastic Case