D'Addario Humidipak Auto Humidity Control System
FEATURES:
- True two-way humidity control
- Maintains constant 45% RH within instrument case
- No water, no drips, no mess
- Long lasting, maintenance-free design
- Includes 1 headstock pouch, 1 Soundhole pouch, 3 Humidipak packets
- Comes with 3 packets and a soft mesh pouch that will not harm your instrument's finish
- Packet last between 2-6 months and should always be kept in a sealed case
- Replace firm packets with the Humidipak Replacement Pack (PW-HPRP-03)