The Integra Boost Humidifier 4 Gram Pack 69% is a maintenance-free, eco-friendly way to ensure your favorite cigars stay fresh. Its responsive Integra BOOST (TM) system quickly releases or absorbs moisture as needed to ensure your cigars maintain their ideal humidity level. To use, simply place the pack and the Replacement Indicator Card with your cigars. When the dot on the card turns blue, it’s time to replace the pack. The 4 gram pack is perfect for use in travel cases and pouches.