Rosette Guitar 3M Fret Polishing Kit- The Utimate Fret Cleaning System Easiest and Safest way to Polish Guitar Frets without aggressive treatment. Features New 3Mtm Graded Micron Polishing Cloth. (4 grades) Quality Stainless Fret Board Guard. Fast and User Friendly- Even with strings on the guitar! Enough material for many Fret Jobs!