1.The adeline guitar soundhole cover incorporates a flexible design that promotes quick installation. Guitarists can play at higher volumes. 2.The guitar soundhole cover allows you to play your electric acoustic at far greater volume.Take your electric acoustic playing to new levels. 3.The design allows for a great fit in most guitar soundholes, while the inert material is safe for your guitar's finish. without unwanted feedback or howling. 4.Simply place the adeline guitar soundhole cover into your guitar sound hole and enjoy a feedback-free performance. 5.The sound hole diameter for your guitar is 4".Your volume will stay the same. The screeching halt prevents all feedback when you're playing live or when amplified. It's great for shows.