Qty 500 10 Mil File Card Laminating Pouches 3-1/2 x 5-1/2 Hot Laminator Sleeves 10 Mils Thick per Flap provides Maximum Protection, Durability & Rigidity Clear glossy finish; 10 mils (250 microns) per flap to add a total of 20 mils to your paper card 3.5 x 5.5 ( 89mm X 140mm ) with standard 1/8" radius rounded corners Sealed on just one edge for easy paper insertion Heat activated thermal adhesive on polyester plastic film