D'Addario Humidipak is the only maintenance-free, two-way humidity control system for guitar. It automatically maintains the optimal 45%-55% relative humidity level within your instrument case, eliminating the guesswork and potential mess related to refilling a humidifier.
No more manual adjustments based on seasonal changes, geographic locations, temperature, or other factors. Note: Humidipak is designed for restoring and maintaining instrument humidity.
[This product is not intended for de-humidification in high humidity environments.]