Really nice rollerball. I love it like I used to love My Tombow before they
changed the color of the blue ink from a royal blue to navy.
Only complaint is the cap doesn't like to stay on.
I have given this ink refill a long test, using daily for months. Still hasn't
run out and makes a nice dark line. I love, love, love these pens and these
refills. I can write really small, like with a finer point pen, but still feel
like I have a line that is easily seen.