Made to fit most common Soundholes, The D'Addario O-Port will provide a fuller sound with more volume, better clarity, and enhanced projection to any guitar from beginner to custom. The O-port will also suppress feedback on acoustic electric guitars and is made from a custom blended polymer for easy installation and to prevent any damage to your guitar's finish.

• Richer, fuller, louder sound with more clarity and better projection
• Simple installation by loosening or removing strings and fitting the O-Port into sound hole.
• Suppresses feedback in acoustic/electric instruments
• Large fits 3.875" - 4" (9.843cm - 10.16cm)
• Small fits 3.375" - 3.5" (8.573cm - 8.89cm)