Legendary among harmonica players for its classic blues harp sound, the Shure 520D tradition continues with the Shure 520DX Green Bullet Harmonica Microphone, which has a contoured size and shape that fits perfectly between harmonica and hands. Legendary among harmonica players for its classic blues harp sound, the Shure 520D tradition of the 520D is carried on by the Shure 520DX Green Bullet Harmonica Microphone, which has a contoured size and shape that fits perfectly between the harmonica and hands ..PZA MORE SPECS