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The pens are excellent. I have been using Rapidographs for years and it was time to replace some of them. The set that I just received are functioning extremely well. There was one glitch with the 6x0 /.13 pen wherein it kept leaking. After disassembling it twice, and cleaning I discovered that the clear ink reservoir "had a pen- hole" in it. Luckily for me I was able to use a reservoir from a much older Rapidograph set and it has been working fine.