rOtring 600 Mechanical Pencil, 0.5 mm, Black (1904443). An iconic tool meant for a lifetime of use. The full-metal body provides ideal weight balance for fatigue-free writing and drawing. Brass mechanism allows precision lead advancement. Lead hardness grade indicator for rapid identification when working. Hexagonal shape avoids sliding on drawing tables. Design, pattern and size of metallic grip zone enable working for long hours without slipping. The fixed lead guidance sleeve prevents breakage and gives you a clear page view for precise ruler-based drawing. Limited warranty: guaranteed for 2 years from original purchase date against defects in materials or workmanship.