Imitation Abalone Fretboard Markers Inlay Sticker Decals For Guitar And Electric Material: PET(Ultra-thin) It is fit for any type,19 frets, 20 frets, 21frets, 22frets and 24 frets. For Electric guitar, acoustic guitar. Easy to install and remove quickly at any time. Package Included: 1 piece Guitar Inlay Stickers.