Xikar 4OZ Crystal Humidifier JarNever worry about your humidor when you're away again. Heading away for work? Going on a holiday? Simply unscrew the lid of this crystal jar and throw it in your humidor to ensure that the humidity stays balanced and level at 70% for 90 days. It couldn't be easier a line on the side tells you when it's time to refill your jar with Propylene Glycol Solution. Steady Humidification of 70%. Refill with Xikar Pre Mixed PG Solution. Lasts Up To 90 Days from