An apparatus for converting a stringed musical instrument with a non fretted fingerboard board to a fretted fingerboard in which the instrument comprises a neck, a plurality of strings extending across said neck, a fingerboard on said neck having a front surface which is selectively engagable by depression of said strings for selective generation of desired sounds when said strings are physically engaged and vibrated, a sound generating chamber or sound pick up area for generating and/or amplifying sounds responsive to vibration of said strings wherein said apparatus comprises an elongate strip shaped to fit over said front surface of the finger board, said strip having a front side including a plurality of raised frets extending perpendicular to the length of the strings and the rear side including adhesive material and being attachable to the front surface of the fingerboard. The strip comprises a bottom plastic layer and each fret is formed from a filament positioned on upon the front surface of said bottom layer at desired spaced intervals along the strip, and a transparent plastic film layer is positioned over said filaments to secure them in place. Alternately, filaments may be embedded in the strip.
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