Caran d'Ache has drawn on its expertise and explored the deepest graphite mines to search out the infinite color nuances of carbon. The result is the Graphite Line, an original concept dedicated to graphite that gives artists the opportunity to compose their own graphite range and explore all the shades of black. An integral part of this line are the Grafcube graphite sticks. Grafcube graphite sticks have a high concentration of graphite and a unique shape that allows lines that are rough and thick, fine, or extra-fine . They come in 2 sizes and 3 degrees of hardness. Grafcubes can be used flat or across their entire length.