Bristol Pads are available in extra white acid-free smooth and vellum surfaces. Bristol Smooth features an extra smooth texture with a silky finish, ideal for detail and technical drawing that enables intricate work. Bristol Vellum features medium texture paper ideal for illustration work. Both erase easily and can be used with pencil, colored pencil, charcoal, pastel, pen and ink, marker, light watercolor wash and airbrush. Paper is made using Hydro-Power and is FSC Certified. Made in Italy. Pads are glue bound (fold over) and contain 20 sheets of 100 lb. (270 gsm) paper.