Our guitar humidifier for sound hole is manufactured with sturdy ABS material, not easy to corrode and age, durable in use and has . 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 . Features - Color: Blue -Material:ABS - Size: 10.80X10.80X1.00cm/4.24X4.24X0.39in - Ensure the humidity in the guitar resonance box, guitar humidifier prevents the box from cracking, and increase the service life 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. - Folk classical guitar sound hole moisturizer, can close the sound hole, fits snugly into a sound hole of the guitar. - With this guitar humidifier, preventing damage to the guitar, using this sound hole humidifier can also help to improve the overall sound. - Sound hole humidifier can help to prolong the life of the guitar, reduces the risk of cracks, warping, and other types of damage. Package list: 5 x Guitar Sound Hole Cover Humidifier