Humidifier that was designed specifically for violoncello and inserts into the sound hole of the instrument and protects it from damages due to dryness. Made of soft latex which is harmless to all instrument finishes, it releases moisture to maintain proper humidity levels. It helps to prevent adverse effects such as bad string action, buzzing, protruding fret ends, cracking, top-sinking, and other damage caused as a result of dryness. Easy-to-follow instructions and a user-friendly humidity gauge are included.