Just saturate your HUMI-CARE jar with a small amount of distilled water and the beads absorb and expand. These specially-formulated beads contain a humidity-balancing solution of propylene glycol, so you’re assured of 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. It’s a no-brainer, ideal for 25-150 capacity humidors - grab a couple of jars if you have bigger humidor or multiple shelves. Keeps your stash in good stead and means very, very little babysitting by you. Each jar is 4oz.