There are two sizes, Big 3.875 inches - 4 inches (9.843 cm - 10.16 cm) and Little 3.375 inches - 3.5 inches (8.573 cm - 8.89 cm) we suggest you measure the opening of your sound hole before purchasing. The O-Port material is custom blended for flexibility to prevent damage to your guitar finish and inlays. Your O-Port will suppress feedback and give your acoustic or acoustic electric guitar a fuller sound with more volume, better clarity and enhanced projection. Just measure your sound hole and choose the O-PORT that best fits.

Big Black

3.875 inches - 4 inches
9.843 cm - 10.16 cm

The Big Black O-PORT is designed for any acoustic guitar with a round soundhole between 3.875 inches - 4 inches or 9.843 cm - 10.16 cm. The Black O-PORT is a very discreet addition to your acoustic guitar.