D'Addario Planet Waves PW-HPK-01 Párásító

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