What is a Euro Format Rollerball Pen Refill?
A Euro Format Rollerball Pen Refill conforms to international standard 12757-1 RB, which defines the dimensions of a standard rollerball refill as 6.3mm in diameter and 110mm in length.
In theory, you can swap any Euro Format refill from one pen to another. However, this is not the case.
In this guide, we explain the different refills in the ISO Standard 12757-1, Euro Format Refill compatibility, who the leading manufacturers are, and what to look for when deciding which Euro Format refill to try to see if it will fit your pen.