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In developing Vicuna ink, Pentel successfully lowered ink viscosity to the lowest limits and achieved the smoothest ballpoint ink. The ink is vivid and bright, and a special lubricant ensures a smooth ball roll. You'll love this ink the instant you start writing. Single-color pens are available as well, and all versions are refillable.
Dimensions: 5.2 inches length, 0.4 inches diameter (13.1 cm length, 1.0 cm diameter).