What is this?The guitar sound hole cover is made of rubber, soft, durable, and safe to insert into the guitar sound hole. Suitable for folk and classical guitars with electric case or built-in pickup.What will I get?The Package Content:2Pcs x Guitar Sound Hole CoverUsable Diameter:100mm/3.94inchOutside Diameter:110mm/4.33inchThickness:11mm/0.43inchMaterial:ABSColor:BlackAre there any advantages of the product?Good toughness, the material is soft silicone, will not damage the guitar paint, can be used for a long time.Eliminate sound feedback to prevent harsh sound in the field due to high volume.How to use it?Easy to install and does not require any other tools. Place the product in the instrument mounting position.What should I notice?Choose a suitable size and pay attention to the size of the mounting size to form a perfect fit with your guitar. The guitar sound hole cover is made of rubber, soft, durable, and safe to insert into the guitar sound hole. Suitable for folk and classical guitars with electric case or built-in pickup. The Package Content:2Pcs x Guitar Sound Hole Cover;Usable Diameter:100mm/3.94inch;OutsideDiameter:110mm/4.33inch;Thickness:11mm/0.43inch;Material:ABS;Color:Black. Good toughness, the material is soft silicone, will not damage the guitar paint, can be used for a long time.Eliminate sound feedback to prevent harsh sound in the field due to high volume. Easy to install and does not require any other tools. Place the product in the instrument mounting position. Choose a suitable size and pay attention to the size of the mounting size to form a perfect fit with your guitar. ASIN B0D14MDRQ7 Size 4 inch Color Name Black Item Weight 6.2 ounces Item model number mea220812ee000154 Package Dimensions 12.2 x 4.33 x 0.59 inches