After swallowing comes the finish, which can be perceived when you exhale through your nose and mouth. This is based primarily on the grapes' ripeness at harvest time. Acidity, which balances alcohol content. Acidity is inherent in the grapes, although its levels can also be manipulated at a couple different stages of the vinification process. It is red wines that contain tannins, as they are extracted mostly from grape skins.
Tannins act as a preservative and so are particularly present in wines meant for long aging.
The finer the wine, the more satisfying the finish. Ruffino wines are known for their long, complex finish.