Planet Waves PW-OPBKL O-Port Sound Enhancement for Acoustic Guitar

O-Port Sound Enhancement for Acoustic Guitar, Large, Black The O-Port will make any guitar from beginner to custom 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. The O-Port will suppress feedback and give your acoustic or acoustic electric guitar a fuller sound with more volume, better clarity and enhanced projection. - Richer, fuller, louder sound with more clarity and better projection - Simple installation by loosening or removing strings and fitting the O-Port into soundhole - Suppresses feedback - Large fits 3.875 #34; - 4 #34; (9.843cm - 10.16cm)