The Humitron humidifier system uses a soft rubber tube with water-absorbent material inside. The humidifier is briefly soaked in water, and then inserted into the guitar sound-whole. After having moistened, wring gently head up / head down to avoid any minor dripping.
The sponge lining tube gradually releases humidity to help prevent cracking due to dryness and low humidity. Insert the Humitron into sound-whole and leave in the guitar when not playing, suggested 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.