Zebra 0.5mm Royal Blue Gel Ink Refill (RJSB5- RBL), for Zebra Multi Function Pen Shabo X Ballpoint Pen, × 5 Pack/total 5 pcs (Japan Import) [Komainu-Dou Original Package]

I wanted gel ink in my pens and these fit perfectly. They write so smooth!

The .5mm is fine point; but it writes very smoothly, as you'd expect from jell ink. The ink color is a very dark blue. Fits both my Rotring and Troika multifunction pens perfectly.

These are perfect refills for my Zebra Telescoping pen which I keep in my car. I love that the ink is like gel or roller ball - it flows well. I would buy again!

THE best-writing 0.5 mm ball pen ever. Very smooth, steady ink flow at most writing velocities. Can even write variable-thinkness lines if you are careful. But it does run out fast. But I get what I paid for, so I'm happy.

This is just what I needed, I was looking for smooth and fine Gel-ink refills for my Moleskine smart pen and these refills are perfect.

It's a much better user experience to write with this ink, but, where a ball point lässt for 3 years, this ink lasted for less than 2 months. Not great. Wasteful even.

Ink is dryer than an old piece of microwaved chicken and the barrels seem to be thicker than standard size

these are only 2-3 inches long. way too short for USA standards.