These Nori Sheets are the traditional ones seen wrapping sushi and rice in sushi restaurants. It is called hoshi nori in Japan. It comes in this pack of 10 sheets that you can cut into shape depending on your application.
Nori, like almost all seaweed, is high in minerals, protein and fibre, and very popular in Japan. In fact, Nori is the most popular form of seaweed in Japan.
These Nori sheets come untoasted. They are generally toasted before use. This is done by holding them over a gas flame or other heat source (an electric cooker ring works fine). Heat until they turn green.