Acoustic Guitar Sound Hole Cover Acoustic Guitar Sound Hole Cover Features Designed for acoustic guitars with a sound hole diameter of 99-101mm. Functions as a guitar humidifier; simply moisten the included sponge and install for reusable humidification. Serves as a guitar dehumidifier, using the included desiccant to absorb excess moisture around your guitar. Can also be used as a standard sound hole cover to eliminate unwanted feedback. Soft rubber covers the insert edge to ensure no damage to your guitar. Specifications Material: Plastic + Rubber Compatible Sound Hole Size: Diameter 99-101mm Item Size: 11cm diameter x 1cm thick / 4.3in diameter x 0.4oz thick Item Weight: 53g / 1.9oz Package Size: 14cm x 12cm x 3cm / 5.5in x 4.7in x 1.2in Package Weight: 102g / 3.6oz Note This sound hole cover is not suitable for guitars where the fretboard extends into the sound hole. The guitar displayed in any images is not included. Package List 1 Sound Hole Cover 1 Sponge 1 Bag of Desiccant