Sound Hole Cover, Mute Cover Feedback Buster Guitar Sound Cover, for Eliminatting Needless for Acoustic Classic Guitar 38''/39'' Specification: Features: Made of rubber material, eco-friendly and durable for long service time. Soft and elastic, won't hurt the surface of guitar, not easy to break. Small size and light weight, convenient to store and use, easy to install and remove. Eliminate needless echo and enhance stage volume without disrupting placement or performance. Fits for 38'' / 39'' Acoustic Guitar Aperture, suitable for amateur guitarists or professional guitarists. Specification: Condition: 100% Material: Rubber Color: Black Suitable for 38'' / 39'' Acoustic Guitar Aperture Weight: Approx. 77g Package Included: 1 x Guitar Sound Hole Cover Note: Please allow slight deviation for the color and measurement. Thanks for your understanding.