Parker Rollerball Pen Refills, Fine Point, Black Ink, 6/Pack (S0406300) 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 Rollerball pen durability. Fit all Parker Rollerball Pen.