The Rotring Isograph College Set is a brilliant and durable set of high-quality drawing instruments. It contains three Isograph pens, with 0.25mm, 0.35 mm and 0.5mm nibs, all with refillable ink reservoirs and Rotring's patented push-on sleeves for easy access to the ink helix for fast cleaning, even when the ink reservoir is full. You also get a Tikky mechanical pencil, complete with twelve 0.5mm leads, an eraser and a compass attachment, so the Rapidograph Isograph Set is a really comprehensive and excellent-value drawing set. For a similar set but with replacement capillary ink cartridges rather than a refillable ink reservoir, have a look at the Rotring Isograph College Set.