These Acoustic Guitar Pegs Are Made out of Brass , Which Are Durable and Will Last Longer Life Than Other Plastic/bone Pins, Also Preventing Premature Damage to the Bridge Plate. With Metal Composition, These Long Lasting Pins Can Increase Clarity, Sustain and Brightness of Tone, Which is Good for Acoustic Guitars with Excessive Bass. Easy to Use and Quick Install, Great and Smooth Finished Surface with a Very Appealing Look. Fit for Most Acoustic Guitar Instruments, Such As Martin, Taylor or Any Brand Acoustic Guitar. Package Include 6pcs Guitar Bridge Pins. Length: 30.5mm Shank diameter: 5.1mm Head diameter: 8mm String slot: 2mm Bottom diameter: 4mm Taper: 3 degrees Note: Since our bridge pins are handmade, there can be a variation in size of plus or minus 0.5mm. Be sure to measure your current bridge pins to ensure that our Pure Brass Bridge Pins will fit your guitar. If the pins are too big for your bridge, gently sand them down until they fit.