Jack Daniel's single barrel goes through the same treatment that the famous NO.7 does but it with a bit of a difference. For instance it has a Higher ABV of 45%, it is 100% proof and is stored in a different location. Every drop is still filtered through 10ft of sugar maple charcoal ensuring its distinctive flavour and making it not a bourbon. It also has the same ingredients as the NO.7 including rye, grains of corn, barley and pure iron free water. It is still placed in the same barrels and interacts with them in the same way. When it is hot the oak barrels open up their pours to let the whiskey sink in and when it is cold they contract to get the whiskey out. This is what gives the whiskey its colour and oaky charred flavour. Where they place the barrel in the barrel-house is what makes the difference between the whiskeys. Barrels with the potential to be single barrel are placed in the highest point of the barrel-house called the Angels roost. Here the summer temperatures can reach well over 100 degree Fahrenheit and in the winter they can easily drop below freezing levels. These extreme conditions can cause the whiskey to move in and out of the barrel dramatically, resulting in the intense maturation needed to develop the unique flavour of Jack Daniel's Single Barrel.