This pad contains Professional Watercolour paper that is 100% cotton, crafted in Italy and offers the highest quality surface for smooth, even washes, preserving luster and transparency of color. The cotton fibres are internally and externally sized for optimal absorbency and extreme strength. The paper is acid-free and free of optical brighteners, offering a bright natural whiteness of archival quality that does not yellow over time. This wire-bound pad contains 15 140 lb. cold-pressed sheets.