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Sakura Koi Coloring Brush Pens contain dye-based ink. Performs similar to an artist brush. Make fine, medium, or bold brush strokes just by changing the amount of pressure to the nib. The durable tip will quickly spring back to its original shape. The odorless, water-based solvent facilitates smooth blending and layering of colors. Add vibrant color to any sketch, journal, cartoon, illustration, or rubber stamp.