These printers use the GI-21C cartridge:
Canon Pixma G-1230
Canon Pixma G-2270
Canon Pixma G-3260
Canon Pixma G-3270
Canon Pixma G-3271
Canon Pixma G-3272
Canon Pixma G-3290
Canon Pixma G-4270
Canon Pixma G-4280
Epson PIXMA G-1220
Epson PIXMA G-2260