On the rocks normally means with ice. Not everything is normal.
These soapstone cubes are intended for fine spirits like Whiskey that drinkers don’t want diluted by melting ice. Intentions aren’t everything and the principle applies to other beverages.
Nifty slide out box. Snazzy little bag to store the rocks. Six square rocks to stick in the freezer and then in a glass.
Joking and novelty aside, these things stay cold and don’t melt. So if you aren’t doing shots of Sprite and would rather nurse your burn-your-face-off Blenheim Ginger Ale over the span of a couple hours without ending up with 50/50 water soda, these are your best option.
Just beware of glass houses and all that