I purchase hundreds of dollars worth of pens a year for my art work. I normally would not spend a lot on markers. However I decided that to have ultra fine tip markers a little extra might be worth it. Not that the coat was all that much I just dont spend very much on markers I reserve my money for other kinds of pens. These pens did not work from the start. The ones that did work did not work for long at all . I contacted the company and was told because I did not open and use them right away it was 3 weeks they could not assist. They also said there was no guarantee on art supplies. I was very disappointed that this company would not stand behind its products or even really knowledge me.