PW-HPCP-03 Humidity Control System refill "maintain" PW-HPRP-03 er en refill pack for PW-HPK-01 Humidity Control System. HUMIDIPAK MAINTAIN Replacement 3-Pack PW-HPRP-03 D'Addario Humidipak is the only maintenance-free, two-way humidity control system for guitar. 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. 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 dehumidification in high humidity environments. Ideal For:   Care / Maintenance Acoustic Guitar Acoustic/Electric Guitar