Artists and photographers desiring a true archival paper will be pleased with the performance of Epson's UltraSmooth Fine Art Paper. Available here as a 25-pack of 13 x 19" sheets, this cylinder mold-made hot press paper is Double Sided and features an ultra smooth matte finish. Made from 100% cotton rag, this paper also offers a hefty basis Weight of 325 gsm along with a thickness of 18 mil and opacity of 98% for longevity and durability. The paper is acid, lignin, and chlorine free as well as calcium carbonate buffered to help ensure longevity.