Product Description Fans of the popular Pentel Color Brush Pens that we stock in all those colors might be interested in the Pentel Pocket Brush Pen. Its extremely portable with a rollerball-like barrel with a clip. This is one of the nicest brush pens available, favored by cartoonists and artists the world over. Each pen comes with two cartridges. Refill cartridge packs are available with two or six replacement F10 cartridges for the Pentel Pocket Brush Pen. Available in a very rich, intense black.