Parker Ball Point Pen Refills, Medium Point, Black Ink, Pack of 6 These refills are Genuine, in their Original Parker Plastic Tube or in Blister. Each refill brims with Quink proprietary ink formula promising optimal performance Count on consistent ink flow for smooth writing. Engineered to rotate a quarter turn each time it's used, this cartridge offers ballpoint durability. Fit all Parker Ball Pen Except: Facet, Sonnet Mono, Executive Quatro and Esprit.