Four Roses Single Barrel OESK is a Kentucky Straight Bourbon Whiskey bottled at 100 proof and aged 7 to 9 years. It is part of Four Roses' single barrel collection, each bottle drawn from one distinctive barrel using the OESK recipe — one of the distillery's ten proprietary mash bill and yeast combinations. The "E" denotes the high-rye mash bill, and "SK" identifies the yeast strain known for imparting delicate fruit and baking spice character.

On the nose, this bourbon offers baking spices, tea leaves, and caramel. The palate delivers allspice and bright oak, while the finish is mellow and lasting. It is a refined yet approachable pour that works equally well neat, on the rocks, or as the base for a classic highball or bourbon cocktail. The Costco offering is sold as a case of six 750ml bottles.