Derwent Artists Pencils still carry the traditional round barrel and wide core first established in the 1930s. They're perfect for broad strokes and free, expressive drawing. The slightly waxy texture is ideal for layering and blending to produce an infinite spectrum of subtly different hues and tints. The core of the Artists pencil is identical to Derwent Studio pencil core, so they complement each other perfectly. 4mm core. The 12-count set is housed in a durable metal tin.