This guitar humidifier is a clay-filled plastic container that is ideal for guitars, clarinets, violins, cellos, and any other wood instrument that needs help to prevent drying out and cracking.
Did you know that most guitars and other instruments are made out of a material called "wood"? It's true! Also true: wood is susceptible to changes in environmental humidity; changes which can result in warping, cracking and shrinkage. Get yourself a Herco Guitar Humidifier, throw it in your guitar case, and combat moisture damage.