12 Jinhao Fountain Pen Piston Converters, 2.6mm Bore Diameter for Picasso and Duke and Baoer, International Standard Size Ink Absorber Filler

These converters fit pretty much all Chinese fountain pens. The quality is good and they do not leak. Good quality at a reasonable price.

These do not fit all Fuliwen pens. I purchased a Fuliwen Orange Check Silver Line pen, which came with a plunger converter. It is cheaply made so I wanted to upgrade. These do NOT fit this Fuliwen pen. They are too big around and the tip is too broad. It would not feed ink into the job.However, after using them in other pens I purchased, they are good quality and I have not had one fail since my purchase.

These ink converters work better than what was included with my pen. I have a Jinhao X450 and X750. So far I have only used a converter in my X450 with Noodler's Bulletproof Polar Blue and it works beautifully. I will be switching out my X750 soon with one of these converters and my Parker Quink Black ink.

I use the converter for different brand/ types of fountain pens. They fit in most (not in LAMY). Your cartridge holding part of the pen has to have at least a diameter of 8 mm. The cartridge part (clear) is the same size as a regular ink cartridge. The part that pulls the ink in (black) is connected with a golden sleeve to the cartridge. This sleeve makes the converter 2 mm thicker than a regular ink cartridge.I inserted the converter into the fountain pen the same way as an ink cartridge. For some pens, I had to wriggle a bit to get it properly connected. Accidentally I loosened the golden sleeve on one carriage and the whole converter separated into parts. There was no problem to assemble it back.I have the converter only a few days. So far there is no leaking or spilling. I can refill the converter outside the pen, or I also pulled the ink through the tip of the pen. Both ways work fine. I will use the second way in the future, since I don't want to provoke spillage through damaging the clear plastic front part.

Doesn’t fit as advertised

The plunger cups keep breaking off leaving the converter useless. I will have to keep buying replacements (and maybe that's the goal) unless you can tell me how to prevent this.

So Fast delivery And Nice product quality

These converters are a good deal for their cost, and they fit Jinhao pens perfectly. They will fit other standard international pens, though the seal is not always perfect, depending on the pen. The plastic may be a little brittle; I had one crack during cleaning after a few months of use. But for the most part, they're about what you'd expect this type of converter.

The package contained the items as described, first test show functional as stated