hey Zip! With the exception of one image (the green sketches of the old lady) everything traditional I've posted is in a non-erasable medium. Mostly ball-point pen/micron and Tombow dual brush pens. I also use a Pentel Pocket brush a lot, and I like faber-castell brush pens a bit for doing lines sometimes. My current process is using a very light blue/gray Tombow to lightly sketch, then go over it with pen. Right now I'm using a Horizon Ohto mechanical pen a lot, seems better than most. But yea, no erasing.