Business Source - BSN09955 Round-ring view binder offers crystal-clear, nonglare overlays to customize the covers and spine for your letter-size presentations. Back-mounted metal rings allow pages to lie flat. 1-1/2" capacity holds up to 350 letter-size sheets. Clear pockets on the inside covers offer extra document storage with a 30-sheet capacity for each pocket. Design also features a sturdy chipboard core and exposed rivets. Binder is made of polypropylene for durability and resilience.