The Short Capless Rollerball refill is a category of refills made by only one company, Schmidt.

These are some of my favorite refills.

The refills are rebranded by most pen companies that make the pens that fit these refills. For US pen makers it’s oddly less expensive to buy custom-printed refills from Germany than to buy the standard refills that have already been imported into the US.

Retro 51 branded refills are the only source I’m aware of for purple ink.

Pens that fit these refills usually also fit Parker-style G2 and hacked Pentel EnerGel refills cut shorter.

Three tip sizes: 0.6mm, 0.7mm and 1.0mm, in the Schmidt p8126, p8127 & p8120 respectively.