Genuine sour mash bourbon whiskey. Please enjoy responsibly. Bottled at a bold 99 proof, and aged the old fashioned way in New, Charred, American white oak barrels, Ezra Brooks is then charcoal filtered for an unmistakable. Unforgettable. Mellow flavor. Charcoal mellowed. A genuine sour mash bourbon, made using the finest ingredients available for generations, Ezra brooks whiskey has been the whiskey for those with a rugged spirit and taste for adventure. Sour mash.