Diameter of 7.2cm.KFC Soymilk Cup Bottom Diameter 7.2cm is designed to meet the caloric needs of the drinker, at 7.2cm in diameter, the calories are just the right amount to reach the body's need value. KFC Soymilk Cup BottomThe bottom of this cup is just the right size to hold enough heat to be slowly released in the coffee to keep the drink warm and bring you the perfect coffee experience without making the drink slightly salty due to too much heat.