The D Addario Fret Polishing System is the secret to making any guitar or bass frets shine like new. Contains 5 sheets of reusable fret polishing paper and a polishing template to place over the fretboard during polishing. Within minutes you can remove all the dirt, grime, and corrosion from your frets that kill the tone and feel of your instrument. The Fret Polishing System is one of the easiest ways to improve your instrument s performance, tone, and appearance.