Rice paper is an edible substance that is used for making fried spring rolls, or salad rolls.
It has white rice, flour, tapioca flour, salt and water in it and is sold in thin, crisp translucent round sheets.
These sheets are wrapped in cellophane and then dipped in hot water to make them soft.
They are find to be eaten in small amounts, but they hold no nutritional value for them at all.
They will not benefit them.
If presented with one, piggies will probably have a nibble at them but nothing more than that, which is fine.