The Hohner Blues Bender P.A.C. professional harmonica gives everybody access to the bluesy notes needed to make any blues or rock riff complete. The Blues Bender P.A.C. harmonica's Patented Acoustic Covers are based on Hohner's famous Marine Band harp but with thicker-than-normal reed plates for consistent tone and durability. Originally patented by Jacob Hohner in 1897, the special shape of Blues Bender harmonica's cover increases the volume of air between the reeds and coverplates which-when thrown into vibration and vented through the special side vents-means greater volume and projection. The Blues Bender harp is extremely airtight between the mouthpiece and the reed plates, for easier note bending and enhanced expressive playing.