The Humitron Cello Humidifier helps keep your orchestral string instrument playing at its best. Its simple rubber tube design with a sponge insert provides easy humidification for your cello in drier climates or seasons. You can maintain the ideal humidity level to prevent damage and improper tuning caused by lack of moisture. The compact, portable humidifier travels conveniently with your cello case, ensuring your instrument stays properly conditioned no matter the environment. Keep your cello sounding its richest with the Core Humitron Cello Humidifier's simple effective humidity control.