Ecoline Duotip marker pens are a set of 3 markers in the colors 205 Lemon Yellow, 337 Magenta, and 578 Sky Blue Cyan. These markers have two different nibs, a narrow bullet-shaped nib and a wider chisel-shaped nib, allowing you to make fine or broad lines and color larger areas. They are suitable for drawings, illustrations and watercolor effects. The markers contain food coloring and gum arabic and can be mixed with water for beautiful color transitions. They adhere well to a variety of paper and should be stored horizontally to distribute the dye evenly. Dried out ends can be revitalized by wetting them with water. Store your artwork in a portfolio for optimal color retention.