Preventing acoustic guitar feedback is easy with the Dunlop DSB312 Suppressor Pro. Just pop this lifesaver in your guitar's soundhole, and you're ready to perform. It won't mess with the tone of your acoustic guitar, but it will allow you to turn up your volume on stage without worrying about howling feedback. The DSB312 Suppressor Pro is made from a lightweight aluminum plate, with a flexible rubber ring that will fit most standard-sized acoustic guitars. So if you play out live, get the Dunlop DSB312 Suppressor Pro for feedback-free performances.