Sailor Shikiori Four Seasons Ink Cartridges (Set of 8) Sailor Shikiori Shigure fountain pen ink is is now available in cartridge form! The name of the ink color is embossed on each cartridge and come in a pack of eight. Each cartridge set comes in its own white portable carrying case. Sailor fountain pen ink cartridges are proprietary, and only fit Sailor fountain pens that accept cartridges.