Retro Tornado Easy-Flow Ballpoint Ink Refill
This Easy-Flow ballpoint refill is compatible with the Retro Tornado Rollerball Pen.
While the Retro Tornado Pens normally come with rollerball refills, you can convert your pen into a ballpoint with these refills. Comes in a pack of 3, and is available in black or blue ink.
Ink model numbers for compatibility: REF-71B and REF-77B.