This EnerGel Gel Pen Refill 0.5 mm Green provides green ink, 0.5 mm point for reliable everyday writing and refill replacement. It helps extend the life of compatible pens or markers while reducing the need to replace the whole writing instrument. A dependable choice for office, school, reception, home office and commercial stationery supplies, Elevate your writing experience with the Pentel® EnerGel® Retractable 0.5mm Green Pen Refill.