uni-ball Micro UB 120 0.5 mm Roller Ball Pen | Ultra Fine & Smoth Ink Flow | Smudge Free Roller Ball Pen  (Pack of 12, Ink Color - Blue)

Water Resistant (Dyestuff Ink particle is easily soluble in water and will bleed on the paper, Super ink – pigmented ink will bond itself to the paper fibers Once it is settled, it is not soluble in water). Light Resistant (The size of Super ink particle is larger than Dyestuff Ink. Therefore its surface is less affected and the colour remains vivid) . Time Resistant (Dye Ink is easily Break down because of the sunlight and air. Super ink is difficult to breakdown).