Acid free, natural white, cold pressed, 140 lb. (300 gsm) watercolor paper. European milled. 100% cotton paper for watercolor. The double wire binding creates a flat surface, allowing the artist to draw across the page. The sturdy black chipboard cover can be personalized with acrylics to make your journal as distinctive as your artwork! Extra heavyweight 100% recycled chipboard front and back cover make these books perfect for field work. Micro-perforated to true size for easy sheet removal. Proudly made in the USA.