DAMPIT has been protecting wooden instruments for decades. Invented and patented in 1966 by profesional violinist and composer, Ralph Hollander, the Dampit has protected the instruments of thousands of musicians worldwide, helping to keep instruments from drying out and cracking, especially in the dry winter months. Requiring only a little tap water, they are simple to use and maintain. The Dampit is cheap insurance for your valuable instrument. Once the humidity drops below 50% - better get out the dampit!