Jack Daniel's Tennessee Whiskey is aged in charred white oak barrels. During the aging process, the whiskey is drawn in and out of the wood giving it its distinctive color and flavor. A portion of whiskey remains in the wood after the barrels are emptied. Some of these barrels are made into Jack Daniel's Wood Smoking Chips. These smoking chips will add the distinctive flavor of Jack Daniel's Tennessee Whiskey to food cooked on gas and charcoal grills or electric smokers. 2.94 liters.