Copic Marker Various Ink Refill for Sketch and Ciao Marker, Cool Shadow Copic Markers-Copic Ink Refill For Sketch & Ciao Markers Can Be Refilled Using the Booster By Dabbing the Ink Directly On to the Nib Or By Removing the Nib With Tweezers For Quicker Filling Features: Refills of fer the Ability to Custom Mix Colors, Measurements Are Marked On the Bottle, the Tip is Angled For Accurate Filling