Write for a mile. Refill allows you to extend the life of your R.S.V.P.® RT retractable or stick ballpoint pen with extra-long-lasting ink. Specially formulated ink delivers consistent, smooth, skip-free writing, and the refill cartridge's durable stainless-steel tip ensures seamless, like-new performance from your pen. Refill Format: Standard Ballpoint; Refill For Series: Pentel® R.S.V.P.® Ballpoint Pens; Refill Ink Color: Blue; Color Family: Blue.