This 25 sheet pack of 13 x 19" Rag Cool Tone 300 Paper from Inkpress Media features archival-grade paper that is made of 100% cotton rag with a cool bright white coating. It is also acid and lignin free and has a heavy basis weight of 300 gsm along with a thickness of 23 mil. This paper is double-sided and features a brightness of 95%. Additionally, the archival paper is light and water resistant for lengthening the lifetime of your prints.