SXR-38

Retractable 0.38mm Rollerballs

0.38mm nib 

Features low viscosity ink, which gives a smooth and fluid writing experience.

Uni's high quality "Super Ink" is not only water and light resistant, but also "Tamper-Resistant", 

meaning that the ink can not be washed off using chemicals 

and solutions used by people to fraudulently modify documents.