D'Addario PW-HPK-01 Humidipak Auto Humidity Control System

The first two-way humidity control that maintains a constant 45%-50% relative humidity level within your instruments case.

Features:

• 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 instrument’s proper humidity level
• No water, no drips, no mess
• Custom made by Boveda for D'Addario