The Winsor & Newton range of Cotman Watercolour Pads & Blocks are produced using the finest top quality acid free mould made paper to ensure maximum stability. Cotman Paper has a natural whiteness & is both internally & externally sized. This sizing ensures even absorption gives brilliance of colour & facilitates removal of Art Masking Fluid. This gummed pad of 15 Water Colour Postcards is 300gsm & measures Approx. 152 x 102mm.