Heavyweight 93 lb. (150 gsm) pH-neutral archival quality drawing paper is well-rounded for mixed media. This natural white sheet has two distinct surfaces. The front side of the sheet has tooth for dry media and works well as a cold pressed watercolor sheet. The back side is fabulous with pen and ink and works well as a hot pressed sheet for watercolor and other mixed media. The double-wire binding creates a flat surface, allowing you to draw across the page. The water-resistant cover can be personalized with acrylics to make your journal your own! Extra heavyweight 100% recycled chipboard back is perfect for field work. There are 60 sheets in these books except for the 14" × 17" and 18" × 24" sizes, which have 50 sheets.