The Brustro Bristol paper features sheets of 250 gsm,paper is produced utilizing hydroelectric power thus reducing greenhouse gas emissions into the atmosphere. Being an ultra-smooth surface is resistant to repeated erasure and scraping. Brustro Bristol paper is Ideal for solvent-based markers, felt tip pen, watercolor, ink, airbrush, pencil & charcoal. Perfect for illustration, design, and mandala, doodling,photorealistic sketches. The bright white coloring makes for excellent contrast. Perfect for artists & amateurs. The absence of acid gives guarantee inalterability over time.