These ballpoint pen refills are for the Jetstream, the popular 0.5 mm pen that’s included in the free bonus set for certain products purchased from the online Hobonichi Store. The pen writes in incredibly smooth, thin lines and does not transfer or leak.



With the product renewal, the ink capacity increased by 10% from the previous product, and the packaging was redesigned.



If you do a lot of writing and run out of ink quite soon, this would be a great way to supplement your ink supply. It can also be used as a refill for other 0.5mm multi-color, multi-functional Jetstream pens.