Designed to fit the majority of standard soundholes, the D'Addario O-Port can deliver a richer sound with increased volume, improved clarity, and superior projection for any guitar, from entry-level to custom-made. Additionally, the O-Port helps to reduce feedback in acoustic-electric guitars and is constructed from a specially formulated polymer to ensure easy installation without harming your guitar's finish.

Small Size – Fits 3.375 inches - 3.5 inches (8.573 cm - 8.89 cm)