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● Blue Refill: The refill Ink cartridges for O'Pen Glow, O'Pen 2, O'Pen Pro, and O'Pen Mini.
● Black Refill: The refill Ink cartridges for O'Pen 2, O'Pen Pro, and O'Pen Mini.
* 3 pieces per pack.
* Black Refill: Please take note that there is a risk of the plastic cap at the end of the pen refill falling off during the installation of O'Pen Glow.