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.

Love it

Great quality product! 👍 🙃

I’ve been a loyal Jetstream user for years because of their smooth ink and reliable writing experience. But the latest batch of ink I bought (this batch) has been a total disaster. The ink cartridges look full but won’t write — no matter how much I scribble, shake, or tap them. It’s like there’s a vacuum or clog that completely blocks the flow. I tried everything, even warm water and alcohol dips — nothing works. What’s worse is that this issue is clearly not a one-off. After searching online, I found tons of people experiencing the exact same problem. So it’s either a huge drop in quality control or they’ve changed something in the manufacturing that ruins performance. For something that’s supposed to be ultra-reliable, this has been incredibly frustrating — especially when I needed them for school and work.

It just does as well as it should be!