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Grafcubes are available in three gradations (3B, 6B & 9B) and in two diameter sizes (10 mm and 15 mm). These are ideal for big format drawings. Use the flat surface for large stripes and the edges for thin stripes. These can also be used obliquely across their entire length or flat. Beautiful, rich, dark surfaces can be obtained with the 9B, plus there is always a sharp edge available for fine details.