^^^^^ I found one like that for my dad.
It was a glass & ice cube set. The ice cube froze into a big ball, much like the one above......as the prevailing scientific theory on the consumption of ice-cooled whiskey is that the bigger the ice cube and the more regular/spherical the surface area, the slower the ice will melt........thus it provides a lovely, cool drink with minimal dilution of the very expensive whiskey/scotch........or you could just drink it straight.......totally eliminating the need for a big fancy ball of ice.......and depending on your mood.......you could potentially eliminate the glass as well.........but now we digress.......