Pendaflex SureHook Letter Recycled Hanging Folder - 3 1/2" Folder Capacity - 8 1/2" x 11" - 3 1/2" Expansion - 11 pt. - Poly - Blue, Red, Yellow, Standard Green - Reinforced, Laminated, Acid-free, Built-in Tension Spring, Reinforced Top, Expandable Gusset