The Cass Art watercolour pad contains 50 sheets of acid free smooth watercolour 300g papers. The 300gsm weight allows this paper to withstand heavy water washes when sized. Acid free and archival quality Internal sizing allows for an even absorbency of watercolours The smooth surface is perfect for fine detailed works. Not only is this a great surface for watercolours, it can also perfect for lino printing, block printing, screen printing or calligraphy. Available in A4 and A3 sizes.