Flanger FU-10 3-in-1 Acoustic Guitar Sound Hole Cover Humidifier Moisture Reservoir Dehumidifier

Features: Designed for acoustic guitar with 100mm 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. Discounted at only: US$ 11.99