Derwent Graphite XL Blocks are watersoluble smooth graphite blocks. They can be used dry or wet and allow artists to achieve a wide range of washes and graphite grays ranging from the deepest blacks to more subtle, transparent grays. The highly versatile chunky block can be used for broad coverage and expressive mark making. Break into pieces or grate into a powder for detail and textures. Each pastel-like block contains a high volume of formula, equivalent to eight pencils.