One bottle of Buffalo Trace, Single Oak Project, Barrel #9 Bourbon Whiskey! The Buffalo Trace Single Oak Project produces a series of experimental bourbon whiskies in half-bottle sizes 375 ml). According to Buffalo Trace, "It all started with 96 individually selected American oak trees that differed according to the number of growth rings per inch and growing location. Each tree was then cut into two parts—top and bottom—yielding 192 unique tree sections. A single barrel was constructed from each unique section. Prior to construction we varied the stave seasoning times. The 192 barrels were then charred differently. These single oak barrels were then filled with different recipe whiskeys, at various entry proofs and aged in a variety of different warehouse styles." Barrel #9, which was part of the 10th release of bourbon, is described as "dusty, with notes of bittersweet chocolate and coffee grounds. Shows its charms after a while in the glass."