I love that the tip doesnt break apart and how you can press hard without worrying. The ink flows easily and is deep black, and it doesn't smudge, which is the best you can get from a fineliner.
Very fine black liner really nice
I seriously love these pens. I have bought extras to give away as gifts! I don't know what it is exactly, but when I reach for a fine liner this is one of my favs!