The "uni-ball one" has a newly developed ink with an outstandingly beautiful, simple and streamlined appearance. The black ink of the "uni-ball one" is much darker than that of a regular black gel pen, and the colored inks are also much more vivid than those of a regular gel pen. If you look back at the notes written with "uni-ball one", you will notice that the notes are much clearer and sharper than before. We conducted a research with Ritsumeika University, during which we looked for a connection between memory and writing from the point of view of cognitive psychology. The results of the research confirmed it, and we can now safely say that darker and clearer lines help memorization better. We are proud that uni-ball one won the iF design award in 2021 (the iF design award is one of the most important design awards in the world. For 65 years, manufacturers and designers have been striving to win the internationally recognized iF mark The iF design award is synonymous with exceptional design and excellent service.) Ball material: stainless steel. Ball size: 0.5 mm. Letter length: approx. 400 m.