Rollerball with Hybrid conical tip for pleasantly soft writing. Line width approx. 0.5 mm. Practical wallet with 4 pieces: black, red, blue, green. Waterproof according to ink standard ISO 14145-2. The innovative Super-Flow-System guarantees consistent ink flow from start to finish. The large ink reservoir has a level indicator and every drop of ink is used. The cap-off ink does not run dry even if the cap is removed for 2-3 days. The One Hybrid C has a high-quality metal clip and an ergonomically rubberised surface that provides a secure hold for relaxed writing.