0.5 mm refill for the Energel Tradio Gel Pen by Craft Design Technology.
Kaweco G2 Gel Rollerball Refill
$ 7.00
Ohto Gel Refill .5mm - Black
$ 2.00
Zebra Sarasa Grand Refill 0.5mm - Sepia Black
$ 2.25
Zebra Sarasa Grand Refill 0.5mm - Green Black