Pilot Hi-Tec-C Coleto Multi Pen Ink Cartridge - 0.3 mm - Blue

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.

Wonderful product. I used to hate multi pens because they tend to have colors that I do not like but with Coleto, I can choose the colors I want and need to use, a well as the points. I only hope that they are more generous with the ink. I wish I discovered this before I bought different color pens for note taking.