Pilot Calligraphy Ink Refills exclusively fit the Pilot Parallel Pen. Create beautiful calligraphy with these vibrant blendable inks. They are also perfect for custom lettering and artwork. Every artist and writer should have these pens on their desk. The Parallel Calligraphy Inks fit pens that are a consumer raved BEST calligraphy cartridge pens ever invented. Add a twist to your writing!