The complex formula is created by blending more than 100 different batches of malt and grain whiskies. After blending, the whisky is filled into used barrels and matured for another few months. This "marriage" process harmonises all components in the formula, resulting in a mellow taste. Bottling is controlled at 51.4% ABV, almost equivalent to 90 British proof, that Nikka blenders determined through repeated experiments to achieve the ideal taste profile.

The iconic square bottle reflects its concept "a small block of whisky" and embodies the intense and rich flavours of the whisky inside. Long after its launch, this bottle is still timeless and recognised for its ultimate simplicity.