Bright, blendable colors in a brush. Lettering and coloring your artwork is simple with the no-mess Koi® Coloring Brush pens with a durable tip will quickly spring back to its original shape. These pens perform similar to a paint brush allowing fine, medium, or bold brush strokes just by changing the amount of pressure to the nib. The odorless, water-based solvent facilitates smooth blending and layering of colors. Koi Coloring Brushes are a convenient way to add vibrant color to any sketch, journal, cartoon, illustration, or rubber stamps. Transparent ink colors blend easily to create a multitude of hues and effects. Use the colorless blender pen or Koi Water Brushes to create seamless washes, layering and color gradations. Recommended age 13+ years