Description The guitar humidifier is made of strong ABS material, which has a good texture and can last for a long time. The guitar humidifier is designed with hygrometer flexibly to meet the needs of different acoustic guitar . A greatguitar humidifier foracoustic guitar sound hole. Features -Color:Black-Material:ABS-Size:10.80X10.80X1.00cm/4.24X4.24X0.39in- When you install the acoustic guitar humidifier on your guitar, the guitar sound hole cover will not damage your guitar, safe to use.- Acoustic guitar humidifier offers a nice and proper way to help you or maintain your guitar.- Sound hole humidifier with hygrometer is easy to use, making it a practical accessory for guitarists.- Acoustic guitar humidifier for sound hole is designed for easy installation and more stable using in the sound hole cover.- Acoustic guitar humidifier works by releasing moisture into the guitars body, helping to prevent cracking and warping caused by dryness.Packing list: 1 x Guitar Sound Hole Cover Humidifier