Rollerball pen with a hybrid conical tip for pleasantly smooth writing. Line width approximately 0.5 mm. Convenient case with 4 pieces: black, red, blue, green. Waterproof according to ink standard ISO 14145-2. The innovative Super-Flow system ensures a consistent ink flow from start to finish. The large ink reservoir features a level indicator, and every drop of ink is fully utilized. The capless ink does not dry out, even if the cap is removed for 2-3 days. The One Hybrid C has a high-quality metal clip and an ergonomically rubberized surface that provides a secure grip for relaxed writing. The ink contains the preservatives C(M)IT/MIT.