This Cartridge 50 Sheet Sketch Pad from Winsor and Newton contains 50 sheets of 110gsm white cartridge paper. This strong, machine-made quality paper allows you to you to rub out mistakes without ruining the surface of the paper. Perfect for sketching with pencil and pen the sheets within this wired bound sketch book are also perforated along the spine for easy removal. The wire binding means there is plenty of room for this sketch book to expand if you decide to experiment with texture and collage in your art. This sketch pad is extremely lightweight so much so that you can carry it with you wherever you go, ready for whenever inspiration hits you!