The K&K Banjo Twin is designed to reproduce the true banjo sound with very natural tone quality and with very little effect on the acoustic tone. The Banjo Twin works well in passive mode, especially if acoustic amps are used. The Banjo Twin does not require any alteration to your instrument. All the components are installed with special double-sided tape or self-adhesive fasteners. These will not harm the finish of your instrument and residue can be removed with WD-40.