Like all Parker® pen refills, these Retractable Gel Ink Roller Ball Pen refills offer a quality writing experience. The ink dispenses flawlessly and the conical roller ball point lays down a bold, dark line. Refill Format: Standard Gel; Refill For Series: Parker® Retractable Gel Ink Roller Ball Pens; Refill Ink Color: Blue; Color Family: Blue.