Bright, blendable colors in a brush. Labeling and coloring your artworks is easy: with the Koi Coloring Brush pens featuring a durable tip, you can quickly return to the original shape. These pens behave similarly to brushes and allow for fine, medium, or bold strokes simply by varying the pressure on the tip. The odorless water-based solvent enables smooth blending and layering of colors. Koi coloring brushes are a convenient way to add vibrant colors to sketches, journals, cartoons, illustrations, or stamps. The 48 transparent ink colors mix easily to create a wide range of shades and effects. Use the colorless blender pen or Koi water brushes to create seamless washes, layers, and color gradients.