500 pouches 4-1/4 x 6-1/4 (4.25x6.25) thermal heat application hot laminating pouches. Perfect lamination supplies to encapsulate 4x6 photos with a clear glossy finish. These laminator pouches have standard 1/8" radius rounded corners and box includes at least 5 silicone coated laminating "carriers" to protect your laminator from adhesive squeeze out. Quality meets or exceeds all major brands. TIPS: Industry standard specification for 3 mil laminating pouches is 3 mils on each flap for a total of 6 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 like folders. Insist on Authentic Oregon Lamination Premium Laminating Pouches. You'll be glad you did.