Pilot Hi-Tec-C Coleto Multi Pen Ink Cartridge - 0.4 mm - 10 Color Set

I've had these pens for about 9 months in both the .3 and .4 sizes. I purchased all the colors in both sizes. All but one of the ink cartridges has segmented out the clear gel and ink so that I can no longer write with the pens. They are always stored horizontally, but somehow the clear gel is now between the ink and the pen tip. Do not buy, they are not nearly as good as the normal Hi-Tec-C pens. Previous to this happening I loved them and used them all the time. REALLY angry at the amount of money they wasted.

Contains:
Black and lead-lead, blue, green and violet, pink and orange, clear blue and blue black, Brown

I love these pens! They are the perfect size. Easy to write with, and easy to load in the pen.

The only problem is that they run out pretty quickly. This system is the perfect solution to carrying around tons of pens!

Flicking the ink cartridge will recollect the ink at the tip when it separates in most cases. My mom taught me this to rescue the pens I hadn't used since I bought them in Japan.

That being said, I adore these pens. I have a full set in the .3 and .4 sizes in all 10 ink colors, plus a .5 mechanical pencil, scattered between two 5-slot and three 4-slot pens. I bought my first ones in Japan while on study abroad, but I avoided using them when I returned because I was afraid of running out and never being able to replace them. Then, I found JetPens, and my favorite writing tool's refills, and have used them almost exclusively for a year now.

Perfect! It runs out a bit fast, but flows smooth and easily as usual. Really fun to pick out the colors and stock your pen barrel yourself, too!