Planetwaves PWHPRP03 Standard Refill Packet – 3 Pack for Humidipak

The D’Addario Two Way Humidification System is a patented “two-way” humidification system that can add or reduce humidity within an instrument and its case. This eliminates the guesswork and maintenance commonly associated with other humidification products.
3 replacement packs for the planet waves humidipak system
Automatic humidity control 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 instruments proper humidity level