Edible rice paper is used for making fresh summer rolls (also called spring rolls)[2] or fried spring rolls in Vietnamese cuisine, where the rice paper is called bánh tráng or bánh đa nem. Ingredients of the food rice paper include white rice flour, tapioca flour,[2] salt, and water. The tapioca powder makes the rice paper glutinous and smooth. It is usually sold dried in thin, crisp, translucent round sheets that are wrapped in cellophane. The sheets are dipped briefly in hot water to soften them, then wrapped around savory or sweet ingredients.
From http://en.wikipedia.org/wiki/Rice_paper
