THE ARRAN PORT CASK FINISHCommunity rating is an important factor to consider when exploring THE ARRAN PORT CASK FINISH single malts. While lacking an age statement, these whiskies age for approximately 8 years in ex bourbon casks before being transferred to wine casks, specifically port. Bottled at 100 proof and without chill filtration or peating, these whiskies are a testament to the expertise of the Arran brand.