10 Cold pressed sheets 450g/m Watercolour Board. Size 20cm x 50cm. The Hahnemuhle Cornwall Panorama Block is a 450g/m watercolour board is bright white, acid free, UV-resistant and of high resistance to ageing. The extra grammage provides a solid board ensures excellent flatness when wet. Ideal for wet painting techniques such as watercolour, Gouache, tempera and acrylics.