Hohner BBBX-D Blues Bender Harmonica, Key of D Key of D Designed primarily to make playing and note bending easy for entry level players, the Blues Bender P.A.C. allows everybody access to the bluesy notes needed to make any riff complete. Airtight construction for easier note bending Patented Acoustic Cover plates for greater volume and projection. The shape of the cover increases the volume of the air between the reeds and cover plates which, improves volume and projection. Thicker reed plates for consistent tone