Xikar Humidifier Jars are a quick and simple way to maintain humidity. All you have to do is take off the cap and place it in your humidor. They can maintain 70% humidity for up to 90 days before you have to refill. Then just add some PG solution and you're good to go up to 90 more days! That's easy enough for everybody to handle. The 4oz jar can handle up to 150 cigars.