After meeting strict aroma, taste and finish criteria, a single, mature rack of only 19 barrels is hand selected and begins its journey to become Calumet Farm Single Rack Black 12 Year Old Bourbon Whiskey. All barrels used are aged in a single, center cut rack from the ideal maturation location and conditions inside the rick house. Calumet use a traditional mash bill of corn, rye and malted barley to craft this premium bourbon.