Hahnemuhle's ZigZag watercolor books feature fine-grain watercolor paper folded in an accordion style, ideal for urban sketchers and creators on the road for all wet painting techniques. The stable 140 lb. (300gsm) weight and surface sizing allows colors to flow and lift without problems and the paper stands up well to repeated erasing. Masking fluids and tapes peel off with no trace of residue. A durable, rugged, oversized book cover and red band helps to protect contents. 18 panels per book.