The Uni-Ball Signo gel roller offers reliable, document-safe, and waterproof pigment ink that dries quickly and provides protection against forgery on important documents. With its ergonomic grip zone, it ensures comfortable and fatigue-free writing. The soft, gliding metal tip makes writing a pleasant experience. The transparent barrel allows for easy monitoring of the ink level. The gel roller, equipped with a push mechanism, has black ink and a line width of 0.4 mm. It is refillable and comes on a blister card.