The larger of the two cups shown holds 6oz with some room to spare. The cup is made by hand out of borosillicate glass, which allows it to hold both hot and cold liquids and be dishwasher safe.
Every cup is made by hand, with no molds, one by one. This means that your cup will not be the exact one in the image, but rather a one of a kind object made within the same design perameters as the cup pictured.