The Core Humitron Bass Humidifier offers a simple, easy-to-use design to maintain proper humidity levels for your orchestral string instrument. Its rubber tube with a sponge interior provides an effective solution for keeping your instrument happy in drier climates and seasons. You can ensure your strings, fingerboard and body stay conditioned for optimal tone and playability. The humidifier's compact, portable size allows you to take it along when traveling to keep your instrument sounding its best no matter the environment.