Package includes 1 Colorless Blender for Sketch Markers, the most popular of the Copic Markers. They are excellent for all forms of illustration, design, scrapbooks, fine art and more. They have an alcohol based ink that is permanent, non-toxic, low odor, and acid-free. Sketch markers have a 3-year shelf life and are guaranteed for color consistency. They can also be used with the Copic Airbrush System.