These hard-cover sketch books feature high performance, pH neutral, lignin- and chloride-free. The heavy-weight 150 gsm paper has a toothy, medium grain ivory surface, and is suitable for all dry media and ink. With both internal and surface sizing, it will accept light washes as well. The covers are made with extra heavy-weight binders' board that is tough and resistant to warpage. These books contain 50 sheets. Bound in the USA.