The Derwent Precision Mechanical Pencil range features a premium metal barrel and a high quality comfortable hold and grip. These specifications allow for consistency and control for detailed line drawing or technical work. The pencils are available in two grade options of graphite core: .5mm and .7mm. Each pencil set includes one mechanical pencil with one HB lead inside, one HB refill box containing 15 HB leads and three replacement erasers.