Smooth surface, natural white sheet, 70lb (114gsm) heavyweight sketch paper is an excellent choice for pencil and ballpoint pens. Recommended for use with Prismacolor Illustration Markers. 50 sheets per double wire side bound pads. 5.5" x 8.5" size is landscape, 3.5" x 5.5" and 8.5" x 11" sizes are portrait style. Get the most out of your shelf space and double stack the 5.5" x 8.5" sketch book for a double facing!