Amount of ink for 1 refill: Classic: approx. 2.5 mL, Sketch: approx. 1.8 mL, Ciao: approx. 1.4 mL Wide: approx. 3.5 mL Number of times you can refill each type of Copic Marker: Classic: approx. 5 times, Sketch: approx. 7 times, Ciao: approx. 9 times, Wide: approx. 3.5 times Ideal to refill your markers as well as creating your own alcohol ink art by dropping the ink directly to the appropriate medium