These pens are useless. They won't write a thing. It feels as if they have a coating on the tip. I will have to throw them away since they aren't returnable.
I haven't used the pen very long but I like the smoothness and darkness of the ink. There should be something on the packaging that tells you to remove the plastic tip on the point however as it took a while to discover it and trying to make it write almost made me throw the whole box full away thinking that the special low price was because they didn't work. Also the tip didn't come off easily until I used a pliers to easily remove it.
I thought there was something wrong with the pens cuz they write so lightly. My friend said I needed to pull off the invisible plastic tip. That fixed the problem!