Uni-ball Signo Broad UM-153 Gel Ink Pen, 4 colors set of Black, Red, Blue, Blue Black (Japan Import) The gel ink ball-point which can be drawn smoothly. Ink color: Black, Red, Blue, Blue Black, (Total 4 colors) The diameter of a ball: 1.0 mm. Bold letter type. Pigmented ink with water resistance / lightfastness / preservability.