In order to bring your severely dried acoustic instrument back from the brink, you need more than a standard humidifier. You need the D'Addario Humidipak Restore Kit. These refills for your hydration kit safely infuses life-giving water vapor into your acoustic guitar or bass in a stepped system that eliminates guesswork and minimizes the risk of over- or under-hydrating. These refills for the Humipak Restore Kit give you all you need to incrementally bring your acoustic and case up to an ideal 45–55% instrument works so hard for you.