D'Addario Pro Soundhole Humidifier GHP

D'Addario's pro soundhole humidifier will last a long time depending on the environment that your guitar is in. This makes is perfect for situations when you are traveling without your guitar or not playing for guitar for a while. The synthetic sponge material can hold up to 12x its weight in water. *Note: When soaking for the first time or after a long while, the sponge will take longer to absorb water than a normal sponge.