Stillman & Birn Hard Bound Sketch Books - These Sketchbooks are made with high performance archival papers offers in both hardbound and wirebound formats. Stillman & Birn offer a choice of two paper shades; Natural White and Ivory. A choice of two paper weights; Heavy Weight - 100 lb. and Extra Heavy Weight - 180 lb. There is a choice of three paper surfaces; Vellum - distinctive tooth, suitable for all dry media and will accept light washes ( paper has both internal and external surface sizing), Rough - substantial tooth and enhanced wet and tear strength suitable for multimedia renderings, Plate - finely calendered, suitable for line drawings with pen and ink without feathering. These papers are compatible with precision erasing techniques. Each book is bound with heavy duty binders board that is super tough and resistant to warpage. All Stillman and Birn Books are bound in the United States.