Designed specifically for acoustic guitars, this sound hole humidifier helps maintain the instrument's structural integrity by providing consistent humidity. Its ABS construction ensures durability, while its compact design allows for easy insertion and removal. This humidifier is ideal for guitarists who want to protect their investment and ensure their instrument sounds great for years to come. Features -Color:Black -Material:ABS -Size:8.50X7.50X2.90cm/3.34X2.95X1.14in -Note: mainly used for guitar. -Soundboard crack protection: prevents the guitar soundboard from cracking due to dryness, prolonging the instrument's life -Stable sound quality: continuous humidification keeps the guitar's sound quality stable, enhancing your performance -Easy and portable: simple and portable design, easy to use, providing humidity protection for your guitar at all times -Versatile guitar use: suitable for acoustic, classical, and other types of guitars, catering to various playing requirements -Efficient maintenance: highefficiency humidification reduces the need for frequent maintenance, saving both time and money Package list: 6 x guitar humidifiers