D'Addario GH Acoustic Guitar Humidifier

The D'Addario Acoustic Guitar Humidifier protects your guitar even in the driest conditions. It's the safest way to guard against cracks, warped necks, and shrinkage, while maintaining your instrument's playability. Suspended by the strings, yet never touches the guitar's body. Maintaining the humidifier is as easy as moistening the sponge when it becomes dry. The frequency of maintenance will vary considerably depending on your specific atmospheric conditions.