Once again the Bruichladdich maltsters faced a challenge with the barley harvest destined for Octomore - to try and coax as many phenols into the grain as they can. This is a delicate, inexact art rather than science, the results varying according to a complex suite of factors. It's part of what makes each edition unique, limited, finite. 7.1 employs barley exclusively sourced from the Scottish mainland, peated to 208ppm. After five years in American oak it was bottled all natural, at a cask strength of 59.5% ABV.