"Premium Boss" employs a manufacturing process that exquisitely blends finely ground coffee beans, a characteristic of "Premium Boss". The addition of coffee oil extracted from deep-roasted coffee beans and the development of a new, exclusive roasting method have achieved both the richness and crisp bitterness demanded of bottled black canned coffee, the "peak of richness" in the history of Boss Black. The result is the "highest-ever richness" in the history of Boss Black.