The bottom of the glass has an ice ball which creates a natural liquid motion increasing the nosing of aromas.
Instruction for Ice Ball:
Fill the included silicone mould to the fill line and put in the freezer to make a single solid ice ball that outlasts traditional ice cubes. Rolling: The shape of the glass makes rolling easy without spilling. A slight hand movement rolls the ice ball around the glass evenly and cools your favourite scotch, whiskey or liquor to perfection!