Pendaflex SureHook Extra Capacity Hanging Pockets have super-strong rods with longer hooks and built-in tension springs to help big, bulky projects glide smoothly on the rails. Full-height, tear-resistant sides expand 3.5" to keep up to 700 sheets neatly contained. A reinforced insert helps support the extra weight and poly-reinforced strips along the sides and bottom resist tears and rips. Letter size, standard green. 4 Per pack.