The Humitron humidifier system is made of a soft rubber tube with water-absorbent material, sponge lining, inside. The humidifier should be briefly soaked in water, wring gently to avoid any minor dripping, and then inserted into the guitar sound-whole. The sponge lining tube gradually will release the humidity needed to prevent cracking due to dryness and low humidity.
When not playing, or in storage, Insert the Humitron Humidifier into sound-whole and leave it in the guitar when humidity is lower than 50%. The Humitron Humidifier will improve the guitar sound in dry weather conditions, and it will protect the instruments against cracking and hairlines.