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. 1" ring capacity accommodates up to approximately 225 letter-size sheets. 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. 1" Binder Capacity - Letter - 8 1/2" x 11" Sheet Size - 225 Sheet Capacity - 3 x Round Ring Fastener(s) - 2 Inside Front & Back Pocket(s) - Vinyl - Black - 12.48 oz