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What kind of pen would be smooth and pleasant to use, even in formal settings?

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We thought that a metal-machined pen (refill pen jacket) that can accommodate the user’s choice of refill could strike a balance between a formal appearance and a personalized writing experience.

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We designed a ballpoint pen (refill pen jacket) that is compatible with almost all refills on the market, without the need for additional parts or modifications. With this refill pen, you can maintain the familiar writing feel of your favorite ballpoint pen while upgrading its appearance to a more formal look.