It’s a middle-sized black mug, as you can see in this picture, which I came across
at Costa's coffee shop. I was shopping when I occasionally went into this cafe and found it. It has a consistent lid, golden frame and a strainer inside, it is an essential cup. I kind of wanted to purchase it for I haven't got one like this at home, but I didn’t buy eventually. I hope I have a chance to get it someday.