Acid free, 110# (180g/m2) ultra smooth, bright white sheet. Great for pen and ink, crowquill pen, technical pens, water-based and permanent markers. Double wire binding creates a flat surface, allowing the art to flow across the page. Sturdy black chipboard cover can be personalized with acrylics to make your journal as distinctive as your artwork! Perfect for field work and micro-perforated for easy sheet removal. Proudly made in the USA.