Pro Acoustic Guitar Care Sound Hole Humidifier Protective Moisture TankSpecifications:Acoustic instrument humidifier with leak-proof open-cell foam that releases moisture slowly and steadily inside the guitar to maintain proper humidity levels. The string-suspended design never comes into contact with the guitar's body. Pour distilled water into the nozzle about once a month to maintain the humidifier. Leak-proof open-cell foam won't drip on your instrument. Item Name: Guitar Humidifier Material: ABS Features: Instrument Care, Easy to Use, Anti-DrySize: 9cm x 8cm x 2cm/3.54" x 3.15" x 0.79" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Included:1 x Guitar Humidifier