TheGyeoulHaneul is a water-based, dye-based ink that is made using membrane-filtered colorants and pure ionised water for maximum purity and stability. The 3Oysters ink bottle is 38mL and has a facet on one corner to create an angle that makes for easier filling when the ink level gets low.

The I.COLOR.U ink collection features colours inspired by the iconic buildings and natural landmarks of the historic city of Seoul.

3Oysters is a brand of quality fountain pen inks from South Korea. Inspired by the phrase "The world is your oyster", their inks represent the ethos of living life to the fullest.