Tom Gauld is one of my favorite cartoonists. (see my reviews of his previous books, Mooncop, You're All Just Jealous of my Jetpack, Goliath, and The Gigantic Robot).
I met him a couple of years ago and he gave me the pen he uses to draw his cartoons: the Pilot Precise V5 Roller Ball Stick Pen. It makes a very clean line, and Tom told me the ink does not fade, even after many years. Now that I've started sketching again (I post some of my sketches on my Instagram account), I was reminded of Tom's pen and reordered a box.