HP EcoFFICIENT paper helps you work and print more efficiently. High performance, lightweight, and ultra-white provides excellent performance on all 16 lb. HP EcoSMART, lightweight and thin paper compatible printers and copiers. With ColorLok Technology, blacks are up to 60% bolder, colors up to 30% more vivid, paper dries up to 3 times faster. Ultra-white shade provides higher print contrast for crisp text and brighter colors. Acid-free for added archival quality that extends the life of the document. Elemental chlorine free. 20% lighter weight for efficiencies in printing, shipping, storage and disposal. Helps reduce mailing costs for heavy documents. HP quality, reliability value - perfect for trouble-free printing, saving time and money. 5000 sheets per carton.