This guitar humidifier is an excellent accessory for maintaining the health of your acoustic guitar. By regulating the humidity levels, it helps prevent damage caused by dry conditions. The humidifier is easy to use, fitting neatly hole, and its practical construction ensures it will provide reliable performance over time. Features -Color:Black -Material:ABS -Size:8.50X7.50X2.90cm/3.34X2.95X1.14in -Note: mainly used for guitar. -Crack prevention: protects the guitar soundboard from cracking due to dryness, extending the instrument's longevity -Stable sound quality: continuous humidification ensures stable sound quality, -Convenient and portable: compact and easy to use design, providing humidity protection for your guitar anytime, anywhere -Applicable to various guitars: suitable for acoustic, classical, and other types of guitars, meeting different playing needs -Good humidification: efficient humidification technology reduces the need for frequent maintenance, saving time and costs Package list: 6 x guitar humidifiers