These pens never fail to produce a crisp dark line (until they run out of ink that is), unlike other roller balls (I'm looking at you BIC) which leave streaks and an inconsistent line.

The .5 is my favorite size since it makes such a fine line

These things are sodium smooth and give clean lines

Love the thin, fluid line.

All the G2 pens are good and lay down a very even and well-filled line, much more so than ball-tip pens.

The one I bought is the 05; if you're looking for a strong red line - buy the 07, or if you want very bold, buy a 10.

Writes a nice small line.

It writes very smooth, with an even, consistent flow of ink, for smooth thin lines on the page

I try to keep a few "extra fine line" on hand to supplement the regular or medium size I buy at Costco

They seem, for me at least, to be the perfect line size for college ruled paper

Nice and narrow lines

I’ve tried the Fine, Extra-Fine, and Ultra-Fine point Ink Cartridges, and prefer the Extra-Fine point Ink Cartridges because they are a best compromise between the finest line printing and easiest to read.

These pens never fail to produce a crisp dark line (until they run out of ink that is), unlike other roller balls (I'm looking at you BIC) which leave streaks and an inconsistent line.