The Integra Boost Humidifier 55% 4g x6 is a pack of six humidification sachets. Once opened and placed in your cigar humidor, the sachet automatically maintains a 55% humidity level in your humidor. You don't have to worry. You will keep your precious modules in optimal storage conditions, without having to do anything: you just have to check the colour of the indicator disc (called Replacement Indicator) and change the bag when this disc changes from pink to blue. These bags can also be used to ensure a constant humidity level for wooden musical instruments (violins, violas, etc.) in their case.