And many recent Wing Sung and Yiren pens use these cartridges as well. I have purchased them on eBay in the past but could only find two sellers this morning. I think that blue, black, and blue-black have been available. There are some sources of confusion.
Both Jinhao and Hero sell cartridges in this odd size with length between short and long internationals.that fit many pens that take short internationals. AFAIK only Hero also makes cartridges in the same shape but the larger bore. The latter are marked 359 while the Hero cartridges compatible with standard internationals are marked 0028, Otherwise the packaging is labeled only in Chinese, and in particular the color of the ink is not show in English. I have ordered what I thought was one color and got another. Today the best deal is an odd one: 359 cartridges that come in shades of green and orange with blue-black ink inside. the eBay heading is
6pcs Blue and black ink only fit for 359 HERO fountain pen ink cartridges
and they are a very reasonable US dollar for six cartridges postpaid. You can also find black ink in normal color cartridges but from that seller you will pay $7 US including shipping for six cartridges. Comparing these to memory I think the color code in the package trim is that blue=blue, gold=blue-black, and white=black (how intuitive!-)
It is true that the opening in the cartridge through which ink flows is closer to Parker than to international, but my experience with a side variety of recent Chinese pens that take large bore cartridges is that Parker cartridges will develop a slow leak between the cartridge and section. It can vary from just a hint of dried ink in that area by the time you run out of ink to a real mess a couple days after inserting the Parker cartridge. Lamy cartridges are much more likely to work, but often will not fit in the barrel. In the specific case of the Hero 359 pen, all three large bore cartridge types have worked well for me.
My experience has been mostly with cartridges. The only converters I see on eBay for the 359 cost more than a 359 so one might as well just buy another 359 that comes with a converter (the norm in my experience). Alternatively you could buy generic converters for big bore pens in general. Here is the title of one eBay listing for those
5pcs NEW OFFICE red new 3.4mm Big hole Fountain Pen Ink Converters
Edited by bob_hayden, 15 April 2018 - 11:17.