Simply submerse the button in a cup of cold water for 1-2 minutes so the clay element in the button can absorb the moisture. Then place in a tobacco pouch or zip lock bag to keep pipe tobacco moist and fresh. If purified or distilled water is used, the humidor button should last a year. However, if tap water is used, the humidor button will need to be replaced more often than that. Approximately 1" in diameter. Made in Hong Kong. (shipping weight 0 lbs)