Watercolour hardcover book, 25 sheets, 300 gsm, cold press. The thread sewn have 30 sheets of 200 gsm paper. Acid free paper, FSC certified, 25% cotton content. It is inside and surface d for optimal painting results. Washable black hard cover, spiral bound. The rectangular die-cut on the cover (spiral) allows to personalize the book just drawing on the first sheet in correspondence of the die-cut.