Check the listing for details. 200 E. Gerber Mylites2 + Half Backs - Bronze Age Comic Book Sleeves 725M2/700HB. Listed at 279.99 USD. This Auction contains: 4 sealed bags containing 50 E. Gerber Standard Current Comic Book Mylites 2 Protective Sleeves (200 Total) 2 sealed pack of 100 E Gerber Standard Half Backs (200 Total) Protect Your Collectibles from the Effects of Aging: The Mylites are made of Mylar and used by National Archives and the Library of Congress so they will be good for your comics! Humidity Volatile Poly Bag Breakdown Acid Migration Oxygen Decomposition Insects Ultra-Violet Fading Molds & Mildew Oils & Greases The Boards are: Made from 100% Acid-Free, 24 Mil Thick cardboard Ensuring extra rigidity and protection Produced with a 3% alkaline buffer Maintains ph of 8.0+ Meets U.S. Government Standards for Archival Storage Dimensions: Mylites are: 7 1/4 " x 10 ½ " plus 1 ½ " flap on the bags. Boards are: 7 x 10 ½” on the Half Back Boards.