The Collection Watercolour high quality surface sized paper is made from 100% cotton rag offering extremely strong fibers and purity. It is vegan, archival and acid-free. The durable paper surface is well suited for demanding watercolor techniques including wet-on-wet painting. The fibers do not lift, rub off or loosen, even when applying multiple layers of color. Available in cold-pressed, hot-pressed and rough. Sheets measure 22" x 30". The 140 lb. (300gsm) weight sheets include ten sheets per pack and the 300 lb. (640gsm) sheets include five sheets per pack.