Refill for Mark's Style Colors Gel Ball Pen's.
Made by Ohto Japan.
Drehgriffel No. 1 Gel Pen Refill - Black
$ 5.00
Energel Tradio Gel Pen Refill: Black - Craft Design Technology
$ 2.00
Kaweco G2 Gel Rollerball Refill
$ 7.00
Parker Gel Refill Black Medium