The Humitron Violin/Viola Humidifier helps keep your orchestral string instrument in peak playing condition with its simple, easy-to-use design. Constructed with a rubber tube and sponge interior, this humidifier allows you to maintain proper humidity levels for your violin or viola. You'll especially appreciate having this humidifier during drier climates and seasons when lack of moisture can negatively impact an instrument's tone and responsiveness. Fitting 4/4 to 1/2 size violins as well as violas of all sizes, the Core Humitron ensures your prized instrument stays maintains adequate humidification so you can protect your investment!