Resealable 2.0 mil Mylar Single Outer - crystal clear jewel box sleeve has flap and sticky strip to seal your jewel box from contact with the air. Dupont Mylar (TM) is the only oxygen impermeable material for archival purposes and is often used to seal food products for long term storage. The sleeve measures 6-1/8 wide x 5 inches tall exclusive of flap. This sleeve may also be used to store the entire contents of a typical jewel case including back tray card and booklet for perfectly flat storage as in the photo below. Sticky strip is on the body of the sleeve and is resealable and reusable. Fits over a standard single jewel case or slim double jewel case.