The Peaky Blinder Irish Whiskey Bourbon Finish is a versatile Irish whiskey marketed as small batch whiskey, or distilled in small batches. This whiskey is oak-aged for several years and undergoes a post-aging in casks that have previously contained bourbon whiskey. The use of these bourbon casks for post-ripening provides this Peaky Blinder whiskey with pleasant sweetness and hints of vanilla, among other things.