Pendaflex SureHook Reinforced Extra Capacity Hanging Pockets, Letter Size, Assorted Colors, 4/PK (09213) SureHook rods with built-in tension springs keep big projects gliding on the rails Full-height, 3.5" wide tear-resistant sides won't catch on drawer hardware Reinforced pressboard insert supports up to 700 sheets Pack of 4 letter-sized file pockets in blue, red, standard green, and yellow; tabs and inserts sold separately Poly-reinforced top edge and bottom fold provide added durability