1 oz string cheese made from 2% milk has 8g protein. The full
fat versions have about 7g protein per oz. Sources:
http://www.thedailyplate.com/nutrition-calories/food/kraft/string-cheese-with-225-milk
http://www.thedailyplate.com/nutrition-calories/food/frigo/frigo-cheese-heads-string-cheese-24-1-oz