Ciao markers feature a Super Brush nib on one end and a Medium Broad nib on the other. The alcohol based inks are permanent, non-toxic, low odor and acid-free. They will not damage paper when blending and layering colors and can be used on many surfaces such as paper, leather, wood, plastics and more. Ciao markers have a 3-year shelf life and are guaranteed for color consistency. They are not compatible with the Copic Airbrush system.