For your drink “on the rocks” you need the best looking ice, with the slowest melting rate (not watering your high quality drink) and that has to be the Gourmet Large İce cubes (weight 35 g. and size Ø 38 x H 41 mm.).
The Gourmet ice cubes are considered the very best ice, but because it is so big and hard, it is not the best option for blender machines. If you need small ice for cocktails, blenders for making smoothies, or food display, your option is out COCKTAIL ICE.