Uni Jetstream Ballpoint Pen Refill 0.5mm, 8 Pieces, Black, Red, Blue, Green [SXR8005]

Use this refil for the four colour (plus pencil) pen. Very good ink

Excellent.

I really like these refills, they fit my pen perfectly and flow nicely. The colours are vibrant, and they seem of good quality. However, on both of the Green refills there is some kind of defect which means once the ink level has reached about half full, the pen essentially stops working. There is still some ink flow, but it produces an inconsistent and very light mark on the page which isn't really usable. None of the other colours exhibit this behaviour, but it's difficult to say they are good value for money when 1/4 of the refills don't work properly.

Great quality product! 👍 🙃

It just does as well as it should be!