This 25-sheet pack of 13 x 19" Photo Rag Baryta Paper from Hahnemuhle features a 100% cotton base with a very finely textured gloss surface finish. The paper also contains barium sulphate to further enhance the density, color gamut, color gradation, and sharpness while maintaining the feel and quality of a traditional paper. It features a basis weight of 315 gsm, a thickness of 15.4 mil, a whiteness of 91%, and opacity of 97%, and is both instant drying and water resistant. The paper is also archival with no optical brightening agents (OBA) along with being acid free and calcium carbonate buffered. It comes on a 3" core.