Sakura Koi Colouring Brush Pens add vibrant colour to any sketch, journal, cartoon, illustration, or rubber stamp art. It performs similarly to an artist brush and features bright, dye-based ink. By changing the amount of pressure on the tip, you can create fine, medium, or broad strokes. The felt tip is durable and springs back quickly to its original shape. The odourless, water-based inks can be layered or blended using a colourless blender pen to create seamless gradations.