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The Opus 88 Koloro fountain pen is truly unique writing instrument. Featuring a sharp alternating material scheme of ebonite and resin, this pen’s design stands on its own. The name Koloro means color in Esperanto, and colourful is what this pen is. The Opus 88 Koloro is equipped with eyedropper filling system and center bar to regulate the ink flow. This is usually only available on high end eyedropper fountain pens. Having the translucent resin portions of the pen allows you to see both your current ink level and your nib while capped. The Opus 88 Koloro features chrome details and a stainless steel #5 JoWo nib. The pen can be filled with the included eyedropper and holds 2ml of ink.