The oak barrels currently widely used in whiskey aging are primarily made of American white oak and European oak.
With the emergence of new whiskey-producing regions, a variety of other wood types are also being experimentally used in whiskey aging, such as Mongolian oak (of which Mizunara is a subtype), American dwarf oak, New Zealand TÅtara oak, etc.
Oak barrels play a significant role in whiskey and various aged spirits, contributing over 60% of the flavors.