This 25 sheet-pack of 8.5 x 11" Portfolio Rag from Museo is an extra smooth matte fine art paper for photographic images. It is made from 100% cotton rag and offers a basis weight of 300 gsm along with a thickness of 17 mil for a high-quality feel. Also, it has a rated brightness of 91%. The archival quality of this paper produces a very long life span thanks to an acid free and internally buffered design. Also, since this paper uses no optical brightening agents, it remains color accurate for a longer time.