Springbank 16 Years Old Rum Wood 1991 is a limited-edition single malt released as part of the Wood Expressions series. The whisky was distilled in June 1991 and first matured in refill bourbon casks for 8 years. It then spent another 8 years in fresh rum casks. It was bottled in August 2007 after a total maturation of 16 years, at a cask strength of 54.2%. Only 5100 bottles were released.