This guitar sound hole humidifier is designed to maintain the optimal humidity level for your acoustic guitar, preventing the wood from cracking and ensuring the instrument remains in top condition. Its sleek design fits hole, making it easy to use and highly effective in preserving your guitar's quality. Features -Color:Black -Material:ABS -Size:8.50X7.50X2.90cm/3.34X2.95X1.14in -Note: mainly used for guitar. -Protection against cracks: prevents the guitar soundboard from cracking due to dryness, extending the instrument's lifespan -Consistent humidity: maintains stable humidity levels to ensure consistent sound quality, enhancing your performance -Portable design: compact and easy to use, providing humidity protection for your guitar anytime, anywhere -Versatile application: suitable for various types of guitars, including acoustic and classical, meeting different playing needs -Simple maintenance: efficient humidification technology reduces the need for frequent maintenance, saving time and costs Package list: 6 x guitar humidifiers