Our guitar humidifier for sound hole is manufactured with sturdy ABS material, not easy to corrode and age, in use and has service life. The guitar sound hole humidifier is designed to maintain the optimal humidity level in a sound hole, preventing the instrument from drying out and becoming damaged. 2-in-1 humidifier with hygrometer for guitar sound hole ruler 99-102mm. Features: With this guitar humidifier, preventing damage to the guitar, using this sound hole humidifier can also help to improve the overall sound. Ensure the humidity in the guitar resonance box, guitar humidifier prevents the box from cracking, and increase the service life of the guitar. Sound hole humidifier can help to prolong the life of the guitar, reduces the risk of cracks, warping, and other types of damage. Folk classical guitar sound hole moisturizer, can close the sound hole, fits snugly into a sound hole of the guitar. Crafted from ABS material, our acoustic guitar humidifier is safe and mild, which will not hurt your guitar and can offer you a nice service. Specifications: Color: White / Black / Blue (Optional) Material: ABS Item Size: 108 * 108 * 14mm / 4.25 * 4.25 * 0.55in Item Weight: 53g / 1.86oz Package Weight: 60g / 2.12oz Package Size: 15.5 * 13.5 * 2cm / 6.10 * 5.31 * 0.78in Package List: 1 * Guitar Sound Hole Cover Humidifier