Crafted in small batches at slow speeds, Fluid watercolor papers possess the strength and working integrity of more expensive mouldmade papers. Fluid 100 is a 100% cotton, natural white paper that is internally and externally gelatin-sized to achieve an archival standard of permanence. 140 LB / 300 GSM COLD PRESS WATERCOLOR PAPER - 100% cotton, archival quality paper that is perfect for applying the finest watercolor paints 12 x 16 WATERCOLOR BLOCK - 15 sheets of the finest-quality 100% cotton watercolor paper per block ACID FREE ARTIST WATERCOLOR PAPER - Fluid 100 is the finest quality watercolor paper that conforms to ISO 9607 standards of permanence, 100% cotton rag and gelatin-sized EASY-BLOCK BINDING - Watercolor artists love these watercolor paper block pads that are bound on 2 sides for easy removal of one sheet at a time.