What variant of Uni Jetstream pens? Because here are a few: SXN-150, SXN-210, etc. Thank you.

This is what I’ve been using: https://www.jetpens.com/Uni-ball-Jetstream-RT-Ballpoint-Pen-...

Although lately I’ve been using this multipen: https://www.jetpens.com/Uni-Jetstream-3-Color-Ballpoint-Mult...

It’s nice having 3 colors of ink available, and it’s not that chunky blue thing we had in elementary school.

I had a similar issue. I like the SXN-210, it has a removal cap and 1.0mm tip size.

I got a box of 12 for a few bucks from Amazon, here is the link since it's hard to search by model,

https://www.amazon.com/dp/B0002LD1NK

I've been using SXN-210 for over a decade and I love them.

Same here. I tried a lot of different pens and these are still the best.