The Signo Gel Impact has a broad writing line making it perfect for people with a large or bold handwriting style and ultra-smooth gel ink combined with a rubber grip make it extremely comfortable to write with. The Signo Gel Impact also contains uni Super Ink, which is fade resistant, water resistant and tamper proof. . Broad (1 mm) line. High quality gel ink rollerball. Contains uni Super Ink; fade resistant, water resistant and tamper proof. Bold writing line