I didnt break it - my dishwasher did which is the first time it has broken anything.
It was one of my good set of four double walled coffee mugs and before that I broke one of my set of four double walled coffee mugs as it fell in the sink and broke.
Moral is, do not buy this Italian brand again as I have many coffee mugs (made of glass) that I have had for years, and I rarely break anything....
So in answer to the question, coffee glasses.