You have scratchy frets? No time or money to go to a luthier? You don't want to remove your strings, even? Don't look further, this is the stuff! polished the scratchiest frets ever on a brand new squier, got it playing good, and had some extra for another guitar who really needed it... Removing a star because they get used up pretty fast, but you can prolly scrape the surface off and reuse them! Just so you know, These are pretty small, and exactly like the rubbers you bought when you were a kid (form and texture) except rougher