Humidify you case and protect your valuable wood instrument. Also, controls case in times of high humidity. No more adding water to sponges, hoses, or discs. No more risk of moisture puddling inside your instrument. Boveda eliminates the hassle (and danger) of one-way humidification methods. These methods spike humidity when you add water, and take a nosedive as the water evaporates. Boveda is pure water and natural salts sealed inside a leak-proof membrane. Boveda adds and absorbs water vapor s...