Review on Copic Gasenfude Nylon Brush Pen: Basic Black - High-Quality Artist Tool for Precise Inking and Coloring by Barb Franz

I've tried about 2 dozen different brush pens over the past year and have currently settled on 3 that I use regularly. Pentel Pocket Brush, Kuretake Sumi and Copic Gasenfude. They all behave differently, so it really depends on what you're using them for. Only criticism is that they are not refillable. Its lines are less dynamic than a pen, less suitable for inking large areas, but offer much better precise control. The ink is excellent and does not spread when washed off with a marker; I used alcohol and water. You won't know if you like the feel and look until you try it, but it's solid.