This refill fits the Ohto Liberty Ceramic Rollerball pen.
Ohto C-305p Ceramic Rollerball Pen Refill - Black
$ 5.00
Recife Rollerball Refill: Black
$ 5.50
Uni Jetstream 0.7mm Refill
$ 2.25
Ohto C-305p Ceramic Rollerball Pen Refill - Red