One of the best things about Tombow Dual Brush Pens is how well the colors blend. This colorless blender is essential for blending. If you'd like to see it in action, I demonstrate how I use it for blending in my Cut Paper Crossover class on Skillshare.

You can purchase them individually here:

Tombow Dual Brush Pen - Colorless Blender

Or in sets of three here:

Tombow Colorless Blender 3-Pack