Office Depot® Purple Heavy-Duty 3" D-Ring View Binder Is Made Of Non-Stick Polypropylene For Reliable Use. Corrugated Cardboard Adds Strength And Durability. Heavy-Duty Binders Hold Everything In Place. Interior Pockets Keep Meeting Notes And Assignments Easily Accessible. Durable Construction And Heavy-Duty D-Rings Withstand Frequent Reference. 3" Rings Hold Up To 650 Sheets Of 3-Hole Punched Paper.