The rOtring 600 Mechanical Pencil is an ideal tool for technical writing, drawing, and sketching. It offers a brass mechanism for precision lead advancement and a fixed lead guidance sleeve for precise ruler-based drawings. This mechanical pencil also features an ergonomic metal barrel and non-slip knurled metal grip to provide an ideal balance of weight and feeling in your hand, and it comes fitted with a lead hardness grade indicator so you can identify and adjust lead grades as you work.