Made by wind power. Refillable Inspiral sketchbooks with 'multipurpose' fine art paper, a sketch paper that will hold a light wash and resist bleed through and buckling. Perfect for marker as well as pen and ink, pencil, charcoal, and pastel. Acid-free, 236g/m2, with a uniform, soft-white medium surface. Refills available. Because of its weightiness, it can also be used to mount and display art.