High-performing papers and heavy-duty features engineered to meet the intense demands of your creative process. They provide greater freedom of expression, offering a full range of paper types and weights requested by artists themselves. Smooth is rated very good for mechanical drawing, airbrush and marker along with pen and ink. Quality/Recommended: Recommended for professional artists and art students. Weight: 270gsm Acid free: Yes Made from: Wood pulp. Colour: White Ideal for: Ideal for mechanical drawing, airbrush and marker along with pen and ink. Texture: Smooth Brand: Strathmore Format (cm): 13.9 x 20.3 cm (approx.), 22.8 x 30.4 cm (approx.), 13.9 x 20.3 cm (approx.), 22.8 x 30.4 cm (approx.) Format (inches): 5.5 x 8 inches, 9 x 12 inches, 5.5 x 8 inches, 9 x 12 inches Sizing: Internally sized. Mould made: Made using a Fourdrinier Machine. A technique from the 19th century, allowing constant quality of the paper.