The D'Addario Screeching Halt Humidifier allows you to humidify your guitar's body and neck joint, even in the driest conditions. The humidifier releases moisture slowly and evenly while capturing the vapor inside the body of the instrument to retain the proper humidity level.

• Doubles as a feedback reducer and humidifier
• Let's the owner humidify the guitar outside of a guitar case.
• Comes with Hydrophilic sponge that holds 12x its weight in water
• Fits 4" Soundhole
• Quick and easy to install & remove
• Soft rubber insert safe for guitar finish