They are relatively cheap, pretty well. Unfortunately, dabs more pins occasionally in my pack. They range from uneven line density (sometimes comes out too much color and then the font is very thick) to real ink droplets (the black pins I had to replace; the green has dropped relatively quickly). I do not know if there are more reliable alternatives, or whether you simply have to come to terms with marker pens, but stupid it's when a precaution a handkerchief must have always in order if necessary to put the pen dry and clean the foil ,
