Twin Marker: Broad and fine for precise highlighting and underlining. Applies indoor, landscape, animation, product, industry, construction, environment art commonly used color and other design drawing 40 Colors: Broad point Suit for coloring(3mm-6mm), Fine point suit for outline(1mm-2mm); Ink is waterproof, fade proof and acid free; Also, most colors in this set can be used as highlighters Good Quality: The water-based ink is non-toxic, blend able, non-bleeding, and odorless; Marker pens are made of strong pigments allowing you to draw at least 300 meters Color-Coded Caps: The color-coded caps allow for ease in organization and use in identifying colors Convenience: Equipped with a beautiful black carrying case for ease in travelling and storing