This EnerGel Gel Pen Refill 0.5 mm Black provides black ink, 0.5 mm point, single refill for reliable everyday writing and refill replacement. It is suited for BLP75 and helps extend the life of compatible pens or markers. A dependable choice for office, school, reception, home office and commercial stationery supplies, For BLP75 pen. Permanent gel ink. 0.5mm. Sold by each.