Description Bungubox Omaezaki Ruri-sora Sky Blue fountain pen ink is a muted shade of blue and comes as a 3ml sample in a plastic vial with a dip at the bottom to allow you to easily get every drop, labeled with the name of the ink brand and color. Bungubox Omaezaki Ruri-sora is made by Sailor for Bungubox pen store in Japan and is very well behaved, has good flow, and is easy to rinse out of your fountain pen. Having trouble deciding between colors? Use our Ink Comparison Tool to quickly and easily view different colors side by side. We offer Free Shipping on all orders over $50 for US customers, and for orders over $250 for our Canadian customers.