This Uni Rollerball Pen Refill 0.7 mm Blue provides blue ink, 0.7 mm point, single refill for reliable everyday writing and refill replacement. It is suited for Sarasa and helps extend the life of compatible pens or markers. A dependable choice for office, school, reception, home office and commercial stationery supplies, Gel ink. Refill for Sarasa, Sarasa Eco and GR8 Gel rolling ballpoint pen. Sold by each.