These 2 mil Comic Book Bags are made of Archival Polyester (Mylar), an inert material of the highest clarity. This bag is a semi-rigid bag and does not require the use of a backer board. But if you do use a backer board, be sure to only use certified acid free boards.
4 sealed bag(s) containing Modern Current Comic Book Archivals 2 Mil Mylar (150 total). 2 Mil Material Thickness. Fits Most Current Comic Books. Made of Archival Polyester.