The Arran Single Malt selected for this cask strength expression was initially matured in first-fill ex-Bourbon barrels for 7 years before being transferred for secondary maturation into smaller Quarter casks also made of the finest American oak for a further 2 years. The process of transferring our whisky into the smaller 125 litre sized casks for their final 2 years of maturation produces far greater contact between the whisky & oak and a faster, more intense maturation.