Universal for all markers the alcohol-based ink is odorless non-toxic and permanent on most surfaces. Color consistency is guaranteed with each bottle. The dropper style tip makes it easy to refill markers and also works well for drip effects. Measurements are marked on the bottle showing exactly how much ink to use. One bottle will refill an empty TOUCH marker 6-8 times. 20ml. Formerly item #1412090-CG4.