The guitar humidifier is an essential tool for any guitarist looking to preserve their instrument's longevity. By maintaining the right humidity levels, it helps prevent warping and cracking of the guitar's wood. Its user-friendly design makes it easy to insert hole, providing consistent moisture to keep your guitar in ideal playing condition. 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 -Maintains sound quality: continuous humidification ensures stable sound quality, enhancing your playing experience -Convenient and portable: small and portable design, easy to use, providing humidity protection for your guitar anywhere -Suitable for various guitars: ideal for acoustic, classical, and other types of guitars, meeting diverse playing needs -Reduces maintenance costs: efficient humidification technology minimizes the need for frequent maintenance, saving time and expenses Package list: 6 x guitar humidifiers