Reference binder features back-mounted rings for a clean professional spine. XtraLife hinge provides durability. Back-mounted design allows sheets to lie flat. Steel nonlocking round rings also have dual opening and closing triggers for easy sheet removal and insertion of your letter-size papers. Two horizontal pockets on the front and back covers secure loose unpunched documents. Each pocket holds 40 sheets. Design also includes exposed rivets and a sturdy chipboard core. Binder is made with a high percentage of recycled post-consumer material.