This 30-pack of 4 x 6" Photo Rag Ultra Smooth FineArt Photo Cards with rounded corners from Hahnemuhle comes packaged in a tin box with an embossed Hahnemuhle rooster logo for protecting your prints and for use as a portable portfolio or archive. The smooth matte paper has a 100% cotton base as well as a heavy weight of 305 gsm. The paper also offers an 18.9 mil thickness, an opacity of 99%, and a whiteness rated at 94%. This high whiteness is achieved through a moderate use of optical brightening agents. The paper is also acid-free and calcium carbonate buffered for longevity and is easy to handle thanks to its instant drying and very high water resistance.