This is a pack of three refills for the Pilot FriXion Ball Slim gel ink pen or Pilot FriXion Ball 3 3 Color gel ink multi pen. It is interchangeable with Pilot's FriXion multi pen refills (model number LFBTRF30EF).
Q: Which FriXion pens are these refills compatible with?
These slim size FriXion refills are compatible with the FriXion Ball multi pens and FriXion Ball Slim pens listed under the Compatible Products link. They are not compatible with full-sized, single-color FriXion gel pens.
It is true that the ink does run out quickly but I would not trade these for any
other note taking pen. The ink is vivid never bleeds and best of all you can
correct your mistakes without having to resort to corrction tape.