Share your travels, urban sketches, and more with Winsor & Newton Watercolor Postcards. Each gluebound pad contains 15 postcard-sized, 140 lb (300 gsm) watercolor sheets ideal for most watercolor styles, gouache, and pen-and-ink. Sheets are crafted from 25% cotton fibers and feature a lightly textured, cold press finish. Internally and externally sized for maximum absorbency and strength, these papers are acid-free and made without the use of optical brighteners. They offer a bright, natural whiteness that does not yellow or fade over time. Each postcard measures 4" x 6".