D'Addario PW-OPBKL O-Port Acoustic Sound Enhancer
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.