Durable 100 percent Pressboard folder has prong fasteners inside both covers and on both sides of dividers. Metal fasteners are 2-3/4" center to center, positioned on the short end of the folder. 25 point blue Pressboard covers have self-tab index tabs in right of center position. Center dividers are made of 20 point Pressboard. Hanger rods fold down for convenient transporting. 2" expansion gusset is made of long-lasting reinforced tape. Classification folder is acid-free.