This is one refill 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 is this refill compatible with?
This slim size FriXion refill is compatible with the FriXion Ball multi pens and FriXion Ball Slim pens listed under the Compatible Products link. It is not compatible with regular size, single-color FriXion gel pens.