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These great gel ink refills fit all of the kits that use Parker style refills. I've been using these for a year and I put them in all of my pens. Like all gel refills they use more ink and the pen should not be left for extended periods of time between uses. I've been able to use them after a month or two of non-use, but you can't go for 6-12 months+ without using the pen.

They write wonderfully smooth. Try them, I know you'll love them.