Product Description GRAFCUBE: 100% pure graphite sticks, available in 10mm and 15mm, and three shades– 3B, 6B and 9B. (3B pictured.) The Caran d’Ache Graphite Line brings together over 30 products, all based on graphite. This line exemplifies Caran d’Ache’s commitment to producing high-quality artists’ pencils– their beautiful color products are among the favorites of Wet Paint staff and customers, and the brilliant step of a line exclusively dedicated to graphite is only logical.