Has a hard "leather-like" cover, these books open perfectly flat and have perforated sheets along the edge for easy removal. Ideal for use in studio or on-the-go. These sketch books are made with 110gsm acid-free cartridge paper, to ensure longevity, FSC certified and sourced from responsibly managed forests.. Each sheet is perforated along the edge to allow for easy removal. These high quality sketchbooks are suitable for use with pencil, pen and ink and light watercolour washes.