This is a brand new Fishman pickup for flat top mandolin. Features a piezo-ceramic pickup embedded in a quality rosewood bridge. It includes a Carpenter 1/4" output jack that mounts on the side of the mandolin. It will not affect the acoustic playing of the mandolin, but it does give you an option to plug it in when your performance needs a boost. This will deliver accurate reproduction of your instrument's unique acoustic sound. When paired with an impedance matched preamp the full potential of the pickup can be realized. Like all Fishman products it is designed for quality sound production and built to last.