Btuty 3-in-1 Acoustic Guitar Sound Hole Cover Humidifier Moisture Reservoir Dehumidifier for 101-103mm Guitar Sound Hole

Features

• Designed for acoustic guitar with 101-103mm sound hole diameter.
• Used as a guitar humidifier, simply moisten the included sponge and install for reusable humidification.
• Working as a guitar dehumidifier, using the included desiccant to absorb moisture around your guitar.
• Can also be used as a normal sound hole cover to eliminate unwanted feedback.
• Soft rubber covers the insert edge, no damage to your guitar.