An indispensible tool for graphite work
"The soft core Blackwing is indispensible for both quick sketches and detailed drawings. The core is lusciously buttery and makes satisfying dark lines; however, a light touch renders a still solid, yet more delicate mark. With a bit of practice, one can forego a set of graphite pencils and merely use this. **Nota bene: this core is soft and requires more frequent sharpening, which is best done in a hand sharpener."