The first 10-Year-Old Straight American Single Malt Whiskey. Stranahans Mountain Angel is pushing the boundaries of American Single Malt Whiskey. This is an ultra-premium expression made with pristine Rocky Mountain ingredients. It is distilled, aged 10 years in new American oak barrels, and bottled over a mile high in the heart of the Rocky Mountains. (47.3% ABV - 94.5 proof)