General Usage This Sketch Book range offers a fine tooth 160gsm paper. Suitable for use with a wide range of dry media such as pencils, charcoal and pen. Heavy duty backing card minimizes bowing and offers a sturdy drawing surface. Suitable for all levels of artists. Also each of our books are wrapped in plastic to offer better protection of this product while wait to be sold. Features Acid free 160 gsm 24 sheets perforated edge for easy sheet removal Available in A4, A3.