Refill for the Ohto Horizon Gel Pen.
0.5 mm line width.
Ohto C-305p Ceramic Rollerball Pen Refill - Black
$ 5.00
Kaweco G2 Gel Rollerball Refill
$ 6.00
Ohto C-305p Ceramic Rollerball Pen Refill - Blue
Recife Rollerball Refill: Black
$ 5.50