Planet Waves Humidipack Refill 3 Packette

Two-Way Humidification Replacement Pack for Guitars; The system automatically maintains the optimum relative humidity level of 45-50% inside the instrument case, increasing or decreasing the humidity level as needed.

When a Humidipak is dry, replace it using one of the three refills included in the Two-Way Humidification Replacement Pack. On average, each pack lasts 2 to 6 months, depending on the location and conditions of the instrument.

Unlike humidifiers that require refilling, the D'Addario system requires no maintenance. It's a long-term solution that doesn't need to be adjusted based on seasonal temperature changes or location. Waterless, drip-free, completely self-contained and clean system.