This Frixion Rollerball Pen Refill 0.5 mm Blue provides blue ink, 0.5 mm point, single refill for reliable everyday writing and refill replacement. It is suited for Frixion® Point and helps extend the life of compatible pens or markers. A dependable choice for office, school, reception, home office and commercial stationery supplies, Refill for Frixion® Point erasable rollerball pen. 0.5 mm. Sold by each.