D’Addario Humidipak Automatic Humidity Control System (For Guitar)

The first two-way humidity control that maintains a constant 45%-50% relative humidity level within your instruments case

Protects your instrument against warping, cracks and other damage cause by lack of humidification

No more manual adjustments based on seasonal changes, geographic locations, temperature, or other factors Unlike refillable humidifiers

Eliminates the guesswork and anxiety of maintaining your instrument’s proper humidity level.