Premiere 500 Series is a 100% cotton fiber paper Regular and is the finest and unsurpassed in quality paper in the comic book art board industry. The regular textured surface works well with pencils and inks as well as pastel and watercolors for textured etchings and feel. The 3-ply thickness gives the paper extra durability. The main advantage of Strathmore is its 100% acid free feature. This prevents the signs of aging such as yellowing.