Eh. Not too thrilled with these. Half of them were leaking after two uses. I live at 7,300 feet, so these may be leaking because of the altitude.Another thing I don't like about these is that the two largest sizes - the .45mm and the .5mm aren't any smaller than a regular wet-tipped pen. The finer pointed pens, .35mm and under, are the only ones I use.Would not buy these again.