Four Roses Small Batch Kentucky Straight Bourbon Whiskey is made from a blend of four different Kentucky bourbons, each distilled at the Four Roses Distillery in Lawrenceburg. Two of the bourbons are comprised of a mash of 60% corn, 35% rye and 5% malted barley, while the other two bourbons are comprised of a mash of 75% corn, 20% rye and 5% malted barley. Each of the bourbons is fermented with a unique, proprietary yeast culture used to bring about a specific flavor in the bourbon.