For the price, you cannot beat them.
The numbers on the pens however were somewhat rubbed off when I got them, however I'm not docking points for that as the pen itself is still perfectly fine and has another end with the numbers on it.
Edit: The darker ones seem to have issue with drying out for some reason. Light/pastel colors are fine however. I have ensure they are secured so it's not user error with at least my batch. Adding some alcohol does make them function properly, but I am docking a star for this issue.