Jwodo fretboard guards can protect your guitar or bass fretboard when filing or polishing a fret. Two nice touches for holding the guard in place with a rubber band, freeing both your hands for the job. Specifications: Item: Fretboard Guards Material: Stainless Steel Size(L W): 87 13mm(3-7/16" 1/2")(Narrow), 87 22mm(3-7/16" 7/8")(Wide) Slot Widths: 1/8" (3mm) Package Includes: 6Pcs x Fingerboard Guards 12Pcs x Rubber Band