Quantity 500 3-1/2 X 5-1/2 Hot Laminator Sleeves With A 10 Mil File Card 500 pouches File (index) Card size 3-1/2" x 5-1/2" (89mm X 140mm) hot thermal (heat activated) clear glossy laminating pouches. 10 mils (250 microns) thick in each flap and sealed on just one edge. These pouches have standard 1/8" radius rounded corners. Quality meets or exceeds all major brands, but at generic pricing. Special 500 pouches per bag packaging includes at least 5 silicone coated laminating "carries" . Maximum card size recommended for this pouch is 3-1/4" x 5-1/4" (or less) to leave a standard 1/8" border of clear laminate around card for a secure sealed edge. TIPS: Industry standard specification for 10 mil laminating pouches is 10 mils on each flap for a total of 20 mils added to your paper sheet. Also, 1 mil equals 1/1000th of an inch (or 25 microns metric). The industry calls these laminating pouches when they are sealed on only one edge instead of three. They should be called laminating folders. Note: All laminating pouches are NOT the same, especially in clarity and bonding. Insist on the authentic Trademarked product this listing is for bearing our purple and white label. 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 ?????