It is true that it is handy these stones. before, I used to drink my whiskey dry because I did not like it to be distorted by these treacherous ice. the problem is now resolved; it is fresh, but not too much, just right. By cons, beware of one thing: if you put Coke over the stones explode like grenades and are able by themselves to devastate a small three-storey building. So to book purists.
