0.5 mm refill for the Energel Tradio Gel Pen by Craft Design Technology.
Ohto C-305p Ceramic Rollerball Pen Refill - Black
$ 5.00
Ohto Pen .7mm refill for Needle Point Horizon
$ 1.50
Kaweco Royal Blue Fountain Ink Cartridges
$ 3.00
Kaweco Summer Purple Fountain Ink Cartridges