Daler-Rowney’s Langton Prestige Watercolour Blocks are the highest-quality products in their popular Langton range. They’re 100% cotton, made the traditional way on a cylinder mould machine, and are soft to the touch with a natural whiteness. They’re acid-free, with an alkali reserve to preserve your work and protect against discolouration, and have a gelatinised surface for strength and resilience. This "Not" block (also known as "cold pressed"), has a slightly textured surface. This is the most versatile variety of watercolour paper, suitable for most types of work. This Daler-Rowney The Langton Prestige Watercolour Block contains 12 sheets of 300gsm paper, each measuring 10in x 14in. Weight 300gsm Sheets 12 Material 100% Cotton Texture Not / Cold Press