The J.A. Custom Marine Band Master Harmonica has unique features, including its own serial number. Players will enjoy the authority they have over this instrument, which is capable of loud and crispy regular notes, stable bends, and easy overbends. The cover plates can be reshaped to improve performance and player comfort. This is by far the model that we sell the most. For people who are looking for a more mellow sound or who plays a lot with a bullet microphone we highly recommend that you go for the closed Rocket AMP covers. The closed covers directs all the sound straight into the microphone, making the harmonica louder when playing amplified.