Well, I can't guarantee that this will be a "lucky" cup, but it's covered in 4-leaf clovers and ladybugs, so who knows??! : )  The mug stands 4" tall and is 2 3/4" in diameter. It comfortably holds 8 ounces.  It is in very nice condition with no major flaws that I noticed.  Very cute for St. Patrick's Day, but fine for all year round, too!