... IL-BM2038. Name: Fresnel Magnifying Sheet, Hot Promotional Magnifying Sheet, Customized Logo Magnifying Sheet, Promotional Bookmark, Magnifying Bookmark, Magnifying Sheet, Card Magnifier, Magnifier ... you have ever looked at the lens of a magnifying glass, you know that it is thick in the middle ... It would not be very easy to make a big magnifying glass lens because it would be thick, heavy. Now, the ...