Product Description Each sketchbook features acid free paper, 100gsm / 70 lbs, off-white sheets- 64 sheets per book. Extremely affordable, sewn binding lays flat, and compact for easy transport. Great for sketching, drawing,journaling, writing, etc. Lay Flat sketchbook -due to the sewn binding this sketchbook can lay and stay completely flat. Ideal for traveling , sketching on-the-go, and journaling