West Cork Irish Whiskey 5 Year Old Single Pot Still continues to celebrate true innovation at West Cork Irish Whiskey. Our pot still whiskey is composed of a unique mash ratio of 66:33 malted versus unmalted barley. The mash is then distilled in our unique Rocket Still, the fastest pot still in the world. It is then matured in First Fill Ex Bourbon Casks and bottled at 43% after 5 patient years.