The J.A. Custom Marine Band Basic Harmonica has unique features, including its own serial number. The harmonica features expert reed work for a loud, warm sound and good bends. 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.