Fretboard Markers Inlay Sticker Decals for Guitar - Tree Of Life-AR Material is PET You can install these on your electric or acoustic guitar with 24 3/4 inch(628mm) 25 1/2 inch(648mm) guitar. These sticker could cover original dot marks easily. They will not get caught by your fingers while playing! It is fit to any type, 21 frets,22 frets and 24 frets!!