The 9618 Acoustic Sound Hole Cover is Ernie Ball's acoustic guitar hole plug. Easy to install and compatible with most acoustic guitar holes, the 9618 is used to eliminate the feedback effect generated by preamp systems

9618 hole plug overview The Ernie Ball

hole plug suppresses unwanted noise and feedback, maximizing the performance of your electrified acoustic guitars. The cap is designed to fit most holes and is made with durable and soft rubber material, without damaging the surface of the guitar. Protect your guitar from unwanted screeching and humming, while removing dirt and debris inside the guitar with the Ernie Ball acoustic plug, easy to install

Strengths of Ernie Ball's 9618 hole plug