This paper is made of 100% long grain cotton fibre and is sized in a manner that allows for repeated reworking and easy lifting of color. This paper is a warm, inviting sheet that is truly archival and acid-free. Unlike most other papers, this professional sheet is free from bleach or other optical brighteners which not only devaluate the archival nature of other watercolor papers, but actually make other watercolor papers harder to work. Each weight and surface is sold only in packs of 10. All sheets have 4 deckle edges and are 22x30" in size.