Pilot Hi-Tec-C Coleto Multi Pen Ink Cartridge - 0.4 mm - Blue Black

Awesome blue black, because this line of pens is very dark, this is just the kind of blue black I like, is just like a black ink with a bit of bluish tint added to it. Just perfect.

this WILL work with the dr. grip 4+1 series. all you have to do is take the refill out of your dr grip 4+1 then take the top off of the coleto refill and make sure both are the same height (if the are not, cut with scissors to adjust) then put the coleto refill in the spot of the dr. grip.

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.

Love being able to trim the Hi-Tec-C Coleto refill and use it with the Zebra Clip-On multi pens. It's the only way I've found, so far, to get 0.3mm tip or smaller on a multi-pen.

This is my favorite ink/pen line. I use the 0.4 in black - very smooth and great for taking notes. Highly recommended.