PEPIN Watercolour Postcard Books contain 16 cards (15 x 10,5 cm |4¼”x6”) made of the finest FSC-certified watercolour paper. The heavy (250gsm) acid-free paper is suitable for watercolour painting and other techniques, with space for a message and stamp on the reverse. The PEPIN colouring collection boasts a variety of art styles, such as Natutal History themes, classical art styles, ethnic styles and artist-themed books.