Copic Various Ink marker refills are 25cc bottles of ink to fill any Copic marker. Ink is alcohol-based, provides consistent color, and is economical and ecological. Refill the markers you have and recycle the empty refill bottle. Match the color number on the marker with the corresponding ink refill. Use the refill booster attachment -sold separately- or dab ink directly onto your marker nib. One bottle typically fills Ciao marker 15 times, Sketch markers 12 times, original markers 9 times, and Wide markers 7 times. Warm Gray 5 refill