Saturate your HUMI-CARE jar with a little distilled water and the beads expand. Specially-formulated beads contain a humidity-balancing solution assuring a slow, steady release of moisture and constant humidity of 65-70%. Each refill with water typically lasts 1 to 2 months, and each jar can be refilled over and over for up to a year before replacing. Great for 25-100 capacity humidors - grab more than 1 jar if you have a bigger humidor. Each jar is 4oz.