Of couse! Well...actually...I am planning on doing a youtube video explaining what materials I use and where people can get them. You might be able to see them in this youtube video. It just came out a minute or 2 ago. [link]
A gel pen uses ink in which pigment is suspended in a water-based gel. Because the ink is thick and opaque, it shows up more clearly on dark or slick surfaces than the typical inks used in ballpoint or felt tip pens. I love them, they are super fun to work with.