I think that it is the easiest to write in a thick ballpoint pen, but it is hardly sold at stores. In addition to being able to write firmly for copying, it is convenient to think that it is better than oil pen etc. when writing on envelopes etc.
I purchased it because it has light fastness. Although we have not actually confirmed about this, we are assuming to write on the page to keep it out of direct sunlight, so it will be appreciated if we can deal with this cheaply. I bought "1.0", but I feel I wish it was a little thin.