Print & Poster POLYESTER 'FOLDER' SLEEVES Sealed on one long edge.
These 4 mil Polyester Print & Poster FOLDER SLEEVES are sealed on ONE long edge. They are made from Museum Grade Archival Polyester (Mylar), an inert material of the highest clarity. Our polyester material is approved by the Library of Congress for indefinite storage. We use DuPont Melinex® or a suitable equivalent.