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Our rollerball adapter converts your fountain pen to a rollerball by simply threading this into the section in place of a Bock 250 nib unit. Compatible with any pen that uses a Bock 250 nib unit. Internally, this uses a Schmidt PRS rollerball tip, which allows you to use your favorite ink in a cartridge or converter, with a rollerball tip
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Little Hollow is an amazing maker, and his rollerball inserts for Bock‑style housings are a fantastic option for writers who want the smooth feel of a rollerball without switching to a fountain pen. They offer clean performance, easy ink management, and a familiar writing experience while still fitting seamlessly into custom builds.