Yutsubame (Spring): Inspired by the swallows of spring, Yutsubame is a homage to these messengers of good fortune. This color captures the essence of their graceful flight across stunning sunset skies, bringing a sense of renewal and hope. The name of the ink color is embossed on each cartridge and come in a pack of three. 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. The Sailor Shikiori line is inspired by all the beautiful colors that naturally occur in Japan every year. These inks illustrate the vast beauty that Japan encompasses and flows incredibly well through fountain pens.