According to Baidu Encyclopedia, nine paper cups are common paper cup sizes, and their height, caliber and bottom caliber have certain standards, usually 8.7cm in height, 7.5cm in upper caliber and 5.3cm in lower caliber. Usually used in restaurants, conferences and other places. The capacity of this paper cup is 9 ounces, which is about 250 ml to 300 ml. This paper cup can hold drinks, tea, coffee and other liquids, which is convenient, fast, clean and hygienic.