It is a 21-year-old blend that includes rare and mature malt and grain whiskies from the Johnnie Walker reserves, with some of the whiskies in the blend aged for over 30 years.

The ''XR'' in the name stands for ''Extra Rare,'' which reflects the rarity and exclusivity of the whiskies used in the blend. The whisky is presented in a striking black and gold decanter that is designed to reflect the luxuriousness and richness of the whisky inside.

Johnnie Walker XR 21 is known for its rich and complex flavors, with notes of dark fruit, vanilla, caramel, and a subtle smokiness. It is often enjoyed neat or on the rocks, but can also be used as a base for cocktails.

Overall, Johnnie Walker XR 21 is a premium whisky that is often considered to be one of the finest offerings from the Johnnie Walker brand.