This Uni Ballpoint Pen Refill 0.5 mm Black provides black ink, 0.5 mm point, single refill 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, For G2, G2 Stylus, G2 ex, B2P, DR. GRIP Ltd, G-Knock. Extra-fine point. 0.5 mm. Sold by each.