THESE ARE REPLACEMENT PACKS FOR: D'Addario Humidipak System Ensuring that you instrument and case are properly humidified before using the Humidipak System is essential in order to receive the maximum benefits and longevity of the product. The D'Addario Humidipak Packets allow you to safely restore an instrument and case that is in a known dry condition or has previously not been humidified to the proper humidity level without the damger of over humidification. 75% Relative Humidity level Fits into the pouches provided in the Two-Way Humidification Kits Best solution in getting a dry instrument and/or case up to the appropriate humidity level Eliminates the guesswork and anxiety of maintaining your instrument’s proper humidity level No water, no drips, no mess