Q: Which FriXion pens are these refills compatible with?
These FriXion Gel Pen Refills are compatible with the regular size Pilot FriXion pens listed under the Compatible Products link. They are not compatible with FriXion Ball Slim pens and FriXion Ball multi pens.
Great ink! A little bit faint for my liking--more of a pencil-like dark
grey--but erases without any leftover marks. I once had a problem where the ink
would not come out of the nib. Customer service was great though!