environmentally friendly, strong and durable for a long time of use. The acoustic visor of an acoustic guitar can eliminate unwanted feedback and increase the volume of the stage. The soundhole cover does not require modification of the instrument. Helpful to protect the sound hole. The cover of the guitar's soundhole is convenient to store and use. Installation and disassembly are simple. Guitar sound cover fits folk and classical guitar electrical box or built-in pickup. Package Included:1Pc x Guitar Soundhole CoverSpecifications:Material: RubberColor: BlackSize Optional: S(86mm)/L(100mm)/XL(102mm)Size: As the picture showsNote:Please allow 1-3mm error due to manual measurement. Pls make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!