Planet Waves O-Port™ will make any guitar sound richer, fuller, and louder, with more clarity and better projection. The O-Port material is custom blended for flexibility to prevent damage to your guitar finish and inlays. Your Planet Waves O-Port will suppress feedback and give your acoustic or acoustic electric guitar a fuller sound with more volume, better clarity and enhanced projection.

Large Size - Fits 3.875 inches - 4 inches (9.843 cm - 10.16 cm)