Strathmore 500 Series Bristol Vellum Surface - 11" x 14" (155 ratings) £15.99 Quantity: at £15.99 each Add To Basket 1 in stock. Weight: 2 ply Surface: Medium (Vellum) / Ultra-Smooth (Plate) Media Applications: Medium (Vellum): graphite pencil, colored pencil, charcoal, sketching stick, pen & ink, marker, soft pastel, mixed media, oil pastel, light wash and collage Ultra-Smooth (Plate): graphite pencil, pen & ink, marker, mixed media and collage Created in 1893, Strathmore 500 Series 100% cotton bristol is an industry standard. 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 watercolor techniques.