#20 Recycled Sketch Pad — This medium-tooth, medium-weight, acid-free white sketch paper meets government standards for recycled paper, containing a minimum of 10% post-consumer fibers. It’s ideal for use with charcoal, pastels, For rendering fine, clean lines, this is the one! Considered "the finest paper in the industry for all kinds of pen-and-ink work," Paris Bleedproof Paper for Pens has a smooth, hard surface that eliminates feathering, bleeding, and breaking up of fine lines — ideal for calligraphy and all fine line pen and ink work, including technical illustrations. It can be used with every type of pen, including technical dip and ruling pens. It’s also recommended for computer graphics and a variety of other mediums, pencils, colored pencils, and other mediums.