~Jetstream Multi-Color Multi-Function Refill ~ "Addictive and smooth writing. From the Jetstream series with more than 100 million units per year, we have significantly renewed the paper packaging and 10% more ink supply. Product Features: ■ Made of environmentally friendly paper, the packaging has been renewed to be easy to understand product information at stores. This reduces plastic usage by approximately 25 tons per year (based on our estimate). Also, we have changed the design on the surface of the package to make it easier to find the item when you purchase. The center of the information important when purchasing such as ball diameter and ink color has been displayed largely at the center. By reading the QR code on other surfaces, you can check compatibility with the ballpoint pen body. ■ 10% more volume and can be used for a longer time 10% more ink than conventional refills so you can use one refill for longer. ■ Improved image visibility: When buying refills, there are many users who look for used refills, so we have improved the visibility of the printing of the refill itself. The printing can be clearly seen whether the ink is in or out of ink. About the "Jetstream series" series, it has a "addictive and smooth writing. This is a series of smooth oil-based ballpoint pens that have been very popular with the catch phrase. Released in 2006 in Japan with the pioneering low viscosity oil-based ink, it dries quickly, and has a high level of smooth writing with a thick and clear ink. Since its launch, we have added various new features such as shaft functions, ball diameters, and ink colors. It has received popularity among our customers mainly among men and women. The series has sold over 100 million units per year.