Each volume in this series contains 48 sheets with drawings printed on professional drawing paper in very light grey lines, encouraging you to trace and vary and to add colour. The images are a mix of detailed drawings and basic templates that leave plenty of space for your own creativity. The 180 g/m2 paper is acid-free, lightfast and age-resistant. It is suitable for most colouring techniques, including pencil, crayon, marker, ink and water colour.