These black graphite pencils are ideal for dark sketches.Derwent Onyx delivers dense, rich, jet-black tones, darker than a 9B pencil.Due to its non-crumbly texture, the pencil is capable of sharpening and holding a fine point. This makes it equally good for quick expressive sketches, as well as detailed technical and architectural drawings. This set includes two pencils of each tone (medium and dark) plus a sharpener and eraser.