1、Made of high quality rubber material, eco-friendly and durable for long service time. 2、Soft and elastic, won't hurt the surface of guitar, not easy to break. 3、Small size and light weight, convenient to store and use, easy to install and remove. 4、Eliminate needless echo and enhance stage volume without disrupting placement or performance. 5、Fits for 41'' / 42'' Acoustic Guitar Aperture, suitable for amateur guitarists or professional guitarists. Features: Made of high quality 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 41'' / 42'' Acoustic Guitar Aperture, suitable for amateur guitarists or professional guitarists. Specification: Condition: 100% Brand New Material: Rubber Color: Black Suitable for 41'' / 42'' Acoustic Guitar Aperture Weight: Approx. 94g Package Included: 1 x Guitar Sound Hole Cover (Guitar is not included) Note: Please allow slight deviation for the color and measurement. Thanks for your understanding.