American oak barrels. Cask & barrel bourbon barrel aged zinfandel is the perfect addition to the Barrel series. Heaped in tradition, the Bourbon barrel for centuries has been charred allowing the barrel wood to offer flavor nuances unlike any other. This barrel char imparts flavors of vanilla, tobacco, caramel, and classic oak. Truly a Zinfandel that offers wine characteristics you expect, with an added edge that says Bourbon Barrel aged.