With this Arches watercolor paper block you get 10 sheets of 300 lb. (640 gsm) Arches Cold pressed watercolor paper with the convenience and portability of a watercolor block. The cold-pressed sheets are 100% cotton, acid-free and buffered with an anti-microbial agent to help resist mildew. The Arches Watercolor 300 lb. Block contains Ten 9"x12" sheets per block.