The Dampit mandolin humidifier keeps your mando happy and healthy. Your mandolin sounds its best when the body has just the right amount of humidity. Proper humidity levels can not only make your mandolin sound it's best, but also prolong the life of your instrument. Placed inside your instrument, Dampit releases moisture slowly and evenly inside the mandolin. A handy indicator helps you maintain optimal humidity for your mandolin. Safeguard your beloved acoustic instrument with a Dampit mandolin Humidifier.