10 mil. Letter size (9" x 11 1/2") EXTRA THICK Laminating pouches help preserve those important documents that you want to last forever. These 10 mil. pouches are compatible with almost all heat laminators (check your laminators specs to ensure 10 mil lamination) and include one carrier to prevent curling and potential damage to items printed with sensitive ink. These pouches are clear and glossy on both sides and have rounded corners. Pouches are an extra 1/2" larger than standard paper size to ensure a 1/4" seal all the way around.