Keep your stash fresh with the RAW Hydrostone! The humidifying stone is made of uncoated, natural terracotta clay and fired in a kiln. It was originally developed to keep tobacco fresh on ships in the early days of modern trade. Soak the stone in water for 5 minutes. Then place it with your tobacco or herbs. This will keep your material fresh for a very long time. It can even revive old, dried material and is 100% reusable. A true game-changer from the past!