D'Addario GHP Acoustic Guitar Humidifier Pro Features:
- Advanced drop-in instrument humidifier
- Simple design: just wet, set, and drop
- Suspends by your strings — sponge and stopper never touch your guitar body
- Helps guard against cracking, warping, and finish issues
- Hydrophilic sponge soaks up 12 times its weight in water
- Slow-release process releases moisture gradually over a period of weeks to maintain proper humidity in your case and instrument