Planet Waves Humidipak Automatic Humidity Control System (for guitar)

HUMIDIFICATION SYSTEM: D'Addario Humidipak is the only maintenance-free, two-way humidity control system for guitar. Includes pouches and guitar humidifier packs. PROTECT YOUR GUITAR: Protects your instrument against warping, cracks and other damage cause by lack of humidification. TWO WAY HUMIDITY CONTROL: The first two-way humidity control that maintains a constant 45%-50% relative humidity level within your instruments case AUTOMATIC HUMIDIFIER: It automatically maintains the optimal 45%-50% relative humidity level within your instrument case, eliminating the guesswork and potential mess related to refilling a humidifier. AUTOMATIC ADJUSTMENTS: No more manual adjustments based on seasonal changes, geographic locations, temperature, or other factors unlike refillable humidifiers.