Acme makes by far the best espresso cups I've found. I discovered them while traveling New Zealand. All of the nice coffee shops in New Zealand seem to serve from Acme cups. When I got home I bought their Demitasse espresso cups and saucers in Feijoa. I've been using them on a daily basis for the past 5 years. They still look brand new. They're a delight to drink from. A little chunky, which makes for a really pleasant drinking experience and helps the cup keep the espresso at a good temperature. If you're searching for espresso cups, honestly look no further.
