Index Card Laminating Pouches are 3 1/2" x 5 1/2" and come in 5, 7 or 10 mil thickness. The thicker the laminating pouch the more rigid the result. A 5 mil pouch will be fairly flexible, a 7 mil luggage tag pouch will be more rigid with some flexibility and a 10 mil pouch will be quite rigid.GBC HeatSeal LongLife - Premium quality & clarity with ultaviolet protection.Economy Pouches - Quality pouches provide clear laminated results, packaged in bulk for added savings.