D'Addario PW-SIH-01 SMALL INSTRUMENT HUMIDIFIER Cellulose Sponge, For Smaller Instruments

Maintaining your instrument's humidity level is essential to preserve its playability, sound, and integrity. D'Addario's Small Instrument Humidifier easily fits in smaller cases and releases moisture evenly and slowly to maintain the proper humidity level preventing cracks, warping, and shrinkage to your instrument. Using the humidifier is as easy as moistening the sponge when it becomes dry. The humidifier can also be used in conjunction with the D'Addario Soundhole humidifier (GH) for acoustic guitar cases when your humidity is consistently 20% or lower.
Releases moisture evenly

Ideal for keeping smaller acoustic, bowed and woodwind instruments at the proper humidity level
Small size fits in any case
Releases moisture slowly and evenly
Sponge style humidifier
Safe for all instruments