The Uni UMR-109 Style Fit Gel Pen Refills are compatible with the Uni Style Fit Gel Pen series: Uni Style Fit Single Knock Gel Pen - Refillable - 0.28 mm and Uni Style Fit Single Knock Gel Pen - Refillable - 0.38 mm. These refills come with a nice colored case, which can be used as a refill's storage case.
The UMR-109 gel ink features vivid colors and a water-resistant ink formula.
How to set Style Fit
① Turn the refill cap to break the label, pull it out, and remove the refill. (2) Remove the tip of the holder by turning it counterclockwise. ③Firmly insert the refill into the hole in the rear shaft of the holder. ④Turn the tip of the holder clockwise to attach it to the original position.