Astrobrights Color Paper - Blue - Letter - 8 1/2" x 11" - 24 lb Basis Weight - Smooth - 500 / Ream - Green Seal - Acid-free, Lignin-free, Chlorine-free, Heavyweight Create attention-getting notices, flyers, announcements, bulletins and more with this heavyweight, high-quality, 24 lb. bond. Each sheet is acid-free and lignin-free. Paper also provides consistent, trouble-free press performance. Paper is compatible with copiers, printers and inkjet printers.