Four ink multi-color pen which creates all the colors of the rainbow by mixing and layering the colored ink. Retractable cyan / magenta / yellow / black ballpoints in one pen. Includes a mixing guide on packet. A versatile tool that can be used for drawing, coloring, scrap-booking, sketching and marking. Colored ink tubes in the clear nib provides visual confirmation. Switch effortlessly between inks with the sliding selectors and be ready to sketch in full color wherever you go.