Derwent Onyx Pencil Set, Pack of 4 Pencils, 1 Eraser and 1 Sharpener (2300039) Use them for quick, expressive sketches and detailed technical and architectural drawings Delivers dense, rich, jet black tones, darker than a Graphic 9B pencil with the convenience of a pencil 4mm wide core; round 8mm barrel Holds a fine point Pack includes Onyx, Medium x 2 and Dark x 2, a pencil sharpener and an eraser