The Raw Hydrostone is a small, yet very effective ceramic stone which has been developed, and tested in accordance with one of the leading rolling tobacco factories in Europe. With the Raw Hydrostone, you will never have to throw away dry tobacco again. Allow this stone to soak in water for 5 minutes. Then place it in with your tobacco. The stone gives you moist and pleasant tobacco to smoke. The stone is 100% reusable and made from natural baked terracotta clay.