I bought 4 cups of 230ml. The positives are nice appearance, easy to clean, and thick glass. The major negative is that they are definitely not 230ml. I have a measuring cup and the maximum capacity in ml is 180ml. I also have an espresso machine and while I was drinking my espresso at 180ml, I had to pour it into 160ml so it wouldn't overflow from the cup. Another negative is that the glass gets really hot when you have hot coffee inside. Overall, 4 stars for their price.

Exactly the size needed for a double Greek coffee. It is very convenient for me to measure small portions of rice. Quality that is very difficult to break, at a bargain price.