The Uni-ball One applies the newly developed "Uni-ball One" ink. The pigment in "Uni-ball One" ink minimizes the penetration of the ink into the paper fibre. As a result, it produces vibrant colors on paper and a darker black than ordinary ink pens.
The barrel design is stylish and straightforward. It features a metal oval-shaped clip that can be easily clipped on your notebook or pocket. The joint part of the clip matches its ink colours.
According to research by Ritsumeikan University in Japan, the darker and sharper the letters in black, the easier it is to remember. So, the Uni-ball one gel pen in black ink might become your best tool when studying.
Twenty colours: Black, Blue, Red, Blue Black, Bordeaux Black, Brown Black, Green Black, Green, Lime Green, Orange, Mandarin Orange, Pink, Light Pink, Baby Pink, Violet, Yellow, Emerald, Royal Blue, Light Blue, and Sky Blue.
Compatible Uni-ball One Gel Pen Refills are available in five colours: Black, Blue, Red, Blue-Black, and Orange.