The BCW Comic Book Extenders will help prevent yellowing, retards the aging process, and absorbs and neutralizes the contaminants in comic book pages. These 10 mil sheets go inside the book, next to the paper and ink one fourth of the way in from the front and back covers, only two sheets per book are necessary!
Overall, it's a good product but I would have preferred the micro chamber paper because it's thinner but I could not find the papers - they're out of stock.