The RAW Hydrostone is made from uncoated natural terra cotta clay, kiln-baked. It was originally developed to keep tobacco fresh on ships during the early days of modern trade. The purpose of using a hydro-stone is to keep your herbs fresh while rejuvenating your dry buds. By having a humidifying stone, you can bring your cannabis back to life. What a serious game changer! HOW TO USE A HUMIDIFYING STONE: Allow the hydro stone to soak in water for 5 minutes. Then place it with your tobacco or other legal herbs. It will keep your material fresh for a very long time. It can even bring old dried material back to life and is 100% reusable. BENEFITS OF A RAW HUMIDIFYING STONE: Put moisture back into your buds Keep your cannabis staying fresh Maintain overall marijuana quality Reusable