The Tombow Dual Brush Pen is the brush pen used by professionals. It has two tips - a versatile, flexible nylon brush tip and a fine tip for smooth lines, with a single ink reservoir, ensuring exact color match. Create fine, medium or bold strokes by a change in brush pressure or draw consistent lines for borders, graphics and tight drawings with the fine tip. Water-based ink is blendable, odorless and acid-free. 96 colors available including a colorless blender for shading. Acid-free and odorless. The tips self-clean after blending.