Oasis OH-1 Original Guitar Humidifier

Fits between the strings and protects your instrument from cracks and warping from low humidity The body of Oasis is made from a specially designed fabric that allows water vapor (but not water) to pass through it As the vapor transmission takes place, a vacuum is created and Oasis shrinks to compensate for the loss of water By watching the Oasis shrink, you can determine when it is ready for refill