The Inart A4 180g Sketchbook with 40 Sheets (1550399049) trades the number of sheets for a higher grammage, with 40 sheets of 180g paper that support more intense dry techniques, such as thick charcoal, dry pastel, or multiple layers of superimposed graphite without the paper marking the other side. The more robust weight of the paper prevents the sketchbook, where drawing with more pressure is done, from becoming wavy or transparent, keeping each sheet independent and clean even in heavier work sessions or with materials that release more dust, such as charcoal or dry pastel. Being 100% cellulose and acid-free, it guarantees good durability over time, just like the other references in the line. It is suitable for those who work with dry techniques with heavier lines or dry pastel and prefer a thicker and more resistant paper, even if this means fewer sheets available per sketchbook.