This time the whiskey has spent 15 years and 3 months in bourbon casks, followed by 9 months in sherry butts. This "finish" is the explanation for the "Twin Wood" in the name.
Although Knappogue once had a relationship with Cooley distillery it's most likely that this stuff comes from Bushmills. There are only 1,900 bottles and distribution is focused on the US market where this will cost about $100 a pop.
A very limited number of bottles are allocated for Ireland.