The D'Addario Humidipak Restore Kit 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 danger of over humidification. D'Addario brings you Boveda's patented, automatic, two-way humidity control technology as part of our instrument care line. Based on scientific principles, the patented humidification system completely eliminates the guesswork and anxiety around maintaining your instrument's proper humidity level.