The CASTELL 9000 Jumbo is perfectly suited for quick sketches and drafts as well as shading extended areas and artistic work. Supreme artist quality pencil with extra thick 5.3 mm lead Extra break-resistant due to SV bonding Environmentally safe water-based coating Ideal for professional users for doodling and drawing Available in 5 hardness grades: HB, 2B, 4B, 6B, 8B