These soft-cover sketch books feature high performance, pH neutral, lignin- and chloride-free paper. The extra heavy-weight 180LB (270 gsm) paper has a white cold-press surface, and is suitable all dry media and ink. With both internal and surface sizing, it will accept light washes, wet media and watercolor as well. The flexible, yet rugged covers have soft-bound sewn bindings and rounded edges to prevent fraying. Each book contains 26 sheets.