30 ml bottle of fountain pen ink from Diamine.
Five colors available to choose from:
Uni Nano Dia .9 mm Lead Refill
$ 4.50
Magic Lead Refill - 5.6
$ 23.00
Ohto GS01 Ballpoint Refill 0.7mm Black
$ 2.00
Uni Nano Dia .5mm Lead Refill - Mix