Backbone Bourbon Anniversary Edition Decade Down Uncut 110 ProofABV Proof: 55% 110 Proof About the Product: Decade Down is a straight bourbon where we used a combination of our finest honey barrels between 5 and 7 years old. 25% of the bourbon used had been in sherry barrels for 12 months. Our first batch of Backbone Uncut (our first prod uct) was released in December 2010 thus the reason for this special anniversary edition. We plan to do a new Decade Down release every year going forward.