Easily view the back of your comicsinside their protective sleeve. Made from Archival grade PETG material. More durable than traditional cardboard backing boards. PETG is in the 'Mylar' (polyester) family of plastics which is crystal-clear, archival and acid-free. It is .030" thick, semi-rigid, impact resistant, and fully recyclable!
Each backing board comes with a (removable) protective peel sheet on both sides.