Letter-size paper is made with Elemental Chlorine-free (ECF) virgin fiber content to provide an environmentally responsible choice to meet your printing needs. Curl control construction offers jam-free performance and less downtime. ColorLok technology keeps pigments at and near the paper surface for high optical density and reduced strikethrough. Acid-free material prevents the paper from yellowing over time for increased longevity and performance. Paper is perfect for everyday copying, high-speed volume applications, in-house reports, internal correspondence and more.