The paper utilized to make each of the Fluid Watercolor Field Series Journals is manufactured in a European mill that's masters craft small batches at slower speeds, thereby allowing for the utmost in quality control. Containing (24) sheets of 140lb (300gsm), premium, alpha cellulose paper, these journals offer supreme strength and working integrity. Available in both cold and hot press finishes across (3) sizes, all Fluid Watercolor Field Series Journals are acid-free.