Created in 1893, this 100% cotton bristol is an industry standard. Manufactured with cotton fibre for enhanced surface durability and exceptional results. - Plate surface has an ultra-smooth finish that is unsurpassed for detailed work with technical pen, airbrush and marker. - Vellum surface has a toothy finish that is excellent for pencil, charcoal, pastel and oil pastel as well as pen, airbrush, and light washes. Not recommended for traditional watercolour techniques. This package contains 15 sheets of 100% cotton bristol. 152lb / 250gsm. Acid free. Archival quality. Made in USA.