Full metal body providing ideal balance of weight and feeling Lead hardness grade indicator for rapid identification Hexagonal shape keeps pencil where you want it For precise ruler-based drawing, the sliding sleeve provides a high level of break resistance and an unimpeded view of the page Top of the line mechanical pencils, with Rotring's original design. Full metal body provides ideal balance of weight and feeling for long comfortable usage without slipping. Hexagonal shape avoids slipping on drawing tables. Fixed sleeve for 100% precision.