Superior soft rubber sleeve encloses a special open-cell sponge. Instructions and handy humidity gauge included. The Dampit humidifier provides long-term humidity protection, guarding against cracking and warping. Helps maintain tuning and beautiful tone quality. Its been used by musicians worldwide for over 40 years. This scientifically proven humidifier is perfect for any kind of climate, from desert to tundra. 

Instructions: 
Submerge Dampit in water for 20 seconds then pinch the end to remove excess water. Wipe outside off to prevent the water from touching the instrument. The Dampit is then inserted into the instrument via the f-holes. It can be left in the instrument while playing without loss of tone. The Dampit is best used during dry or excessively warm seasons.