100% Cotton Coldpress Textured 300# (600gsm) 12" x 16" Heavy Weight Block glued on 4 sides Acid-free, Chlorine-free, Lignin-Free, Optimal Brightening Agent (OBA)-Free Same coldpress surface both sides Buckle-Resistant, dries flat Sturdy/durable paper Perfect for watercolor, pastel, charcoal, graphite, pen and ink Synthetically Sized (internal/external)