Marker type Sketch Ciao Classic Wide The number of times that the bottle can refill Approx 7 times Approx 9 times Approx 5 times Approx 3 times Rough indication amount per refill Approx 1.8ml Approx 1.4ml Approx 2.5ml Approx 3.5ml How to refill Copic markers with Copic 12ml refill ink 1. Uncap both ends of the marker 2. Using the tweezer tool, pull the broad nib out from the base 3. Insert Copic Ink nozzle into the core of the marker 4. Once completed, insert back the nib in place CAUTION Please do not use this product for any purposes other than blending ink. Copic Ink is alcohol-based and flammable. Keep away from direct sunlight and extreme temperatures. Keep out of reach of children. Use in a well-ventilated area. Check the ink level of the marker before you add more ink.