Double Letter Laminating Pouches are 11.5 inches x 17.5 inches and come in 3, 5, 7 or 10 mil thickness. The thicker the laminating pouch the more rigid the result. A 3 Mil pouch will be very thin & flexible. A 5 mil pouch will be fairly flexible, a 7 mil pouch will be more rigid with some flexibility and a 10 mil pouch will be quite rigid.