The vibrant colors produce multiple color tones per pen giving you the ability to create stunning effects such as 3D, smooth transitions, highlighting, shading, gradations and blending, all with one pen. Each pen goes from as light as a hint of a tint to rich tones, eliminating tonal gaps in your collection. One pen blends multiple tones. The Chameleon Color Tones system allow you to do more with less!,Double-Ended Pen , Japanese SuperSoft Brush Nib and Bullet Nib, Professional Quality Alcohol-Based Ink, Refillable Inks , Replaceable Nibs, Permanent on Most Surfaces , Compatible with all other Alcohol-Based Inks, Non-Toxic and Low Odor, Ideal for All Paper Crafts, Manga, Graphic and Fine Art