Tannin is an important component in wine and other beverages. In grapes, it is concentrated in the skins, seeds and stems and is extracted into the wine when the grapes are crushed or when wine is fermented in contact with the skins. It's dry bitterness balances the sweetness of the fruit creating a more rounded flavor. Tannin can also improve clarity and improve aging by removing excessive proteins from the wine. Made from chestnut wood.