The F301 comes in Black, Red, Blue, and Green.
they are packaged as a set or indivisually elasewhere.
I prefer using the F701 pens, but really need these additional colors.
Currently I use the F701 in black and I set one up with a blue refill.
The problem is, I cant identify the color by looking at the top as they are both black. I have to write with it to see which is which.
I use the F301 for the red and green (although the green are hard to find).