The Uni-ball One pen uses a newly developed ink called "Uni-ball One". The pigment in this ink minimizes its absorption into paper fibers. Consequently, it produces brighter and more original colors on paper, resulting in a darker black than an ordinary black ink pen and more vibrant colors than other colored ink pens.
The pen has a stylish and straightforward barrel design, with a metal oval-shaped clip that can be easily attached to a notebook or pocket. The clip's joint part matches the ink color.
Research conducted by Ritsumeikan University in Japan suggests that dark and sharp letters in black ink are more memorable. As such, using a Uni-ball one gel pen with black ink may be an effective study tool.
Seven new colors have been introduced: Avocado Green, Cappuccino Brown, Poppy Red, Sesame Gray, Mango Orange, Nemophila Blue, and Plum Purple.
Compatible Uni-ball One Gel Pen Refills - 0.38 mm / 0.5 mm are available in five colours: Black, Blue, Red, Blue-Black, and Orange.