Hi, i have just seen that cross has jumbo ballpoint refill/ high ligher/ for cross selectip roller ball pen, (e.g. cross century II)
I just want to konw, if this kind of ballpoint refill can also be used on other roller pens such as waterman rollerball,lamy etc. thanx

The Pilot G2 gel refill will fit modern Waterman rollerballs but it won't fit the selectip so that's a roundabout way of saying that the Cross refills won't fit Waterman rollerballs. They definitely don't fit any retractable ball point or gel pen.

I don't know about Lamy rollerballs.