<ul> <li>COPIC MARKERS-Copic Various Ink Refill For Sketch &amp; Ciao</li> <li>Markers can be refilled using the booster by dabbing the ink directly onto the nib or remove the nib with a tweezers for quicker filling</li> <li>Features: Refills offer the ability to custom mix colors; Measurements are marked on the bottle; The tip is angled for accurate filling; One bottle of permanent ink will refill a Ciao marker thirteen times and Sketch eight times; Manufacturer guaranteed shelf life of three years; These inks are marked with universal color numbers for each Copic Marker and Spills can be cleaned up immediately with rubbing alcohol</li> </ul>