Rollerball pen with super flow system for even ink flow, large ink supply, verifiable through viewing window, ergonomically shaped and rubberised grip. Schneider One Business 1830 rollerball pen with super flow system for even ink flow. The ink regulator controls ink flow precisely and evenly from start to finish, without spills, no dropouts. Cap-off ink: does not dry even without a cap. Rollerball pen with indelible ink. With ink regulator for perfectly dosed ink flow, the ink level can be controlled via viewing window. Line width: approx. 0.6 mm