The Integra Boost Humidifier 67 Gram Pack 72% 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 humidor maintains its ideal humidity level. To use, simply place the pack in your humidor along with the Replacement Indicator Card. When the dot on the card turns blue, or the pack starts to get hard, it’s time to replace. Use one pack for every 25 cigars your humidor can hold, or one pack per one pound of product in non-cedar humidors.