Lay out egg roll wrappers on a counter. Top each wrapper with a piece of string cheese, 2 tablespoons pizza sauce and 4 pepperoni slices. Roll up, tucking in the sides as you roll. In a deep fryer over high heat, heat several inches of oil to 375 degrees. Add egg rolls, a few at a time. Cook for 2 to 3 minutes, or until golden. Remove with a slotted spoon. Drain on paper towels; let cool before serving.