All the pens listed below use a similar refill.

• Retractable

• Biromatic (pin fitting)

• Citizen (non retractable pin fitting)

• Number 7 (non retractable pin fitting)

They differ by the type of refill holder which is either a pin type or a push type

The pin type fits into the hole in the refill and the push type fits on the outside of the refill into a tapered hole in a plastic holder

These refills fit both types

Both blue and black inks are available and feature a 1mm carbide ball and are approx 113mm long depending on the pen model