Tombow Dual Brush Pen Set of 9 primary color pens with 1 colorless blender pen. Flexible brush tip and fine tip in one marker. Brush tip works like a paintbrush to create fine, medium or bold strokes; fine tip gives consistent lines. Dual Brush Pens are ideal for artists and crafters. The water-based ink is blendable and the resilient nylon brush retains it's point stroke after stroke.