K&K's Mandolin Twin Fusion does not require any permanent alteration to your instrument. The pickups attach to the inside of the mandolin with double-sided adhesive tape, while the carpenter jack remains on the outside of the instrument. It provides the exact same sound quality as the Mandolin Twin Internal because the pickups are mounted in the same positions. The Mandolin Twin Fusion can easily be installed by the musician. A comprehensive step-by-step installation manual describes the process in detail.