Shingles used to contain asbestos which gave shingles their longevity. It has since been banned. Today’s shingles are made up mostly of substitute fillers such as paper and a little bit of fiberglass with some asphalt. Adding even the smallest amount of fiberglass allows the shingle companies marketing division the legal right to call them fiberglass shingles. This can be somewhat misleading and create a false sense of security for todays consumer.