This is Uni Style Fit pen refill inks of pen tip width 0.5mm.  Colors are available in 16 different colors.  Style Fit offers you to choose your favorite body and mix and choose your favorite colors to create your own multi-pen combination.  The ink for Style Fit is the same ink of Uni Signo ink.  Please note that these are refill ink, so you need a pen body to use them.  

* Pen Width: 0.5mm pen width
* Colors: 16 different colors
* More Uni Style Fit series HERE